2 * Asterisk -- An open source telephony toolkit.
4 * Copyright (C) 1999 - 2006, Digium, Inc.
6 * Mark Spencer <markster@digium.com>
8 * See http://www.asterisk.org for more information about
9 * the Asterisk project. Please do not directly contact
10 * any of the maintainers of this project for assistance;
11 * the project provides a web site, mailing lists and IRC
12 * channels for your use.
14 * This program is free software, distributed under the terms of
15 * the GNU General Public License Version 2. See the LICENSE file
16 * at the top of the source tree.
21 * \brief Implementation of Session Initiation Protocol
23 * \author Mark Spencer <markster@digium.com>
26 * \arg \ref AstCREDITS
28 * Implementation of RFC 3261 - without S/MIME, and experimental TCP and TLS support
29 * Configuration file \link Config_sip sip.conf \endlink
31 * ********** IMPORTANT *
32 * \note TCP/TLS support is EXPERIMENTAL and WILL CHANGE. This applies to configuration
33 * settings, dialplan commands and dialplans apps/functions
34 * See \ref sip_tcp_tls
37 * ******** General TODO:s
38 * \todo Better support of forking
39 * \todo VIA branch tag transaction checking
40 * \todo Transaction support
41 * \todo Asterisk should send a non-100 provisional response every minute to keep proxies
42 * from cancelling the transaction (RFC 3261 13.3.1.1). See bug #11157.
44 * ******** Wishlist: Improvements
45 * - Support of SIP domains for devices, so that we match on username@domain in the From: header
46 * - Connect registrations with a specific device on the incoming call. It's not done
47 * automatically in Asterisk
49 * \ingroup channel_drivers
51 * \par Overview of the handling of SIP sessions
52 * The SIP channel handles several types of SIP sessions, or dialogs,
53 * not all of them being "telephone calls".
54 * - Incoming calls that will be sent to the PBX core
55 * - Outgoing calls, generated by the PBX
56 * - SIP subscriptions and notifications of states and voicemail messages
57 * - SIP registrations, both inbound and outbound
58 * - SIP peer management (peerpoke, OPTIONS)
61 * In the SIP channel, there's a list of active SIP dialogs, which includes
62 * all of these when they are active. "sip show channels" in the CLI will
63 * show most of these, excluding subscriptions which are shown by
64 * "sip show subscriptions"
66 * \par incoming packets
67 * Incoming packets are received in the monitoring thread, then handled by
68 * sipsock_read() for udp only. In tcp, packets are read by the tcp_helper thread.
69 * sipsock_read() function parses the packet and matches an existing
70 * dialog or starts a new SIP dialog.
72 * sipsock_read sends the packet to handle_incoming(), that parses a bit more.
73 * If it is a response to an outbound request, the packet is sent to handle_response().
74 * If it is a request, handle_incoming() sends it to one of a list of functions
75 * depending on the request type - INVITE, OPTIONS, REFER, BYE, CANCEL etc
76 * sipsock_read locks the ast_channel if it exists (an active call) and
77 * unlocks it after we have processed the SIP message.
79 * A new INVITE is sent to handle_request_invite(), that will end up
80 * starting a new channel in the PBX, the new channel after that executing
81 * in a separate channel thread. This is an incoming "call".
82 * When the call is answered, either by a bridged channel or the PBX itself
83 * the sip_answer() function is called.
85 * The actual media - Video or Audio - is mostly handled by the RTP subsystem
89 * Outbound calls are set up by the PBX through the sip_request_call()
90 * function. After that, they are activated by sip_call().
93 * The PBX issues a hangup on both incoming and outgoing calls through
94 * the sip_hangup() function
98 * \page sip_tcp_tls SIP TCP and TLS support
100 * \par tcpfixes TCP implementation changes needed
101 * \todo Fix TCP/TLS handling in dialplan, SRV records, transfers and much more
102 * \todo Save TCP/TLS sessions in registry
103 * If someone registers a SIPS uri, this forces us to set up a TLS connection back.
104 * \todo Add TCP/TLS information to function SIPPEER and SIPCHANINFO
105 * \todo If tcpenable=yes, we must open a TCP socket on the same address as the IP for UDP.
106 * The tcpbindaddr config option should only be used to open ADDITIONAL ports
107 * So we should propably go back to
108 * bindaddr= the default address to bind to. If tcpenable=yes, then bind this to both udp and TCP
109 * if tlsenable=yes, open TLS port (provided we also have cert)
110 * tcpbindaddr = extra address for additional TCP connections
111 * tlsbindaddr = extra address for additional TCP/TLS connections
112 * udpbindaddr = extra address for additional UDP connections
113 * These three options should take multiple IP/port pairs
114 * Note: Since opening additional listen sockets is a *new* feature we do not have today
115 * the XXXbindaddr options needs to be disabled until we have support for it
117 * \todo re-evaluate the transport= setting in sip.conf. This is right now not well
118 * thought of. If a device in sip.conf contacts us via TCP, we should not switch transport,
119 * even if udp is the configured first transport.
121 * \todo Be prepared for one outbound and another incoming socket per pvt. This applies
122 * specially to communication with other peers (proxies).
123 * \todo We need to test TCP sessions with SIP proxies and in regards
124 * to the SIP outbound specs.
125 * \todo ;transport=tls was deprecated in RFC3261 and should not be used at all. See section 26.2.2.
127 * \todo If the message is smaller than the given Content-length, the request should get a 400 Bad request
128 * message. If it's a response, it should be dropped. (RFC 3261, Section 18.3)
129 * \todo Since we have had multidomain support in Asterisk for quite a while, we need to support
130 * multiple domains in our TLS implementation, meaning one socket and one cert per domain
131 * \todo Selection of transport for a request needs to be done after we've parsed all route headers,
132 * also considering outbound proxy options.
133 * First request: Outboundproxy, routes, (reg contact or URI. If URI doesn't have port: DNS naptr, srv, AAA)
134 * Intermediate requests: Outboundproxy(only when forced), routes, contact/uri
135 * DNS naptr support is crucial. A SIP uri might lead to a TLS connection.
136 * Also note that due to outbound proxy settings, a SIPS uri might have to be sent on UDP (not to recommend though)
137 * \todo Default transports are set to UDP, which cause the wrong behaviour when contacting remote
138 * devices directly from the dialplan. UDP is only a fallback if no other method works,
139 * in order to be compatible with RFC2543 (SIP/1.0) devices. For transactions that exceed the
140 * MTU (like INIVTE with video, audio and RTT) TCP should be preferred.
142 * When dialling unconfigured peers (with no port number) or devices in external domains
143 * NAPTR records MUST be consulted to find configured transport. If they are not found,
144 * SRV records for both TCP and UDP should be checked. If there's a record for TCP, use that.
145 * If there's no record for TCP, then use UDP as a last resort. If there's no SRV records,
146 * \note this only applies if there's no outbound proxy configured for the session. If an outbound
147 * proxy is configured, these procedures might apply for locating the proxy and determining
148 * the transport to use for communication with the proxy.
149 * \par Other bugs to fix ----
150 * __set_address_from_contact(const char *fullcontact, struct sockaddr_in *sin, int tcp)
151 * - sets TLS port as default for all TCP connections, unless other port is given in contact.
152 * parse_register_contact(struct sip_pvt *pvt, struct sip_peer *peer, struct sip_request *req)
153 * - assumes that the contact the UA registers is using the same transport as the REGISTER request, which is
155 * - Does not save any information about TCP/TLS connected devices, which is a severe BUG, as discussed on the mailing list.
156 * get_destination(struct sip_pvt *p, struct sip_request *oreq)
157 * - Doesn't store the information that we got an incoming SIPS request in the channel, so that
158 * we can require a secure signalling path OUT of Asterisk (on SIP or IAX2). Possibly, the call should
159 * fail on in-secure signalling paths if there's no override in our configuration. At least, provide a
160 * channel variable in the dialplan.
161 * get_refer_info(struct sip_pvt *transferer, struct sip_request *outgoing_req)
162 * - As above, if we have a SIPS: uri in the refer-to header
163 * - Does not check transport in refer_to uri.
167 <depend>chan_local</depend>
170 /*! \page sip_session_timers SIP Session Timers in Asterisk Chan_sip
172 The SIP Session-Timers is an extension of the SIP protocol that allows end-points and proxies to
173 refresh a session periodically. The sessions are kept alive by sending a RE-INVITE or UPDATE
174 request at a negotiated interval. If a session refresh fails then all the entities that support Session-
175 Timers clear their internal session state. In addition, UAs generate a BYE request in order to clear
176 the state in the proxies and the remote UA (this is done for the benefit of SIP entities in the path
177 that do not support Session-Timers).
179 The Session-Timers can be configured on a system-wide, per-user, or per-peer basis. The peruser/
180 per-peer settings override the global settings. The following new parameters have been
181 added to the sip.conf file.
182 session-timers=["accept", "originate", "refuse"]
183 session-expires=[integer]
184 session-minse=[integer]
185 session-refresher=["uas", "uac"]
187 The session-timers parameter in sip.conf defines the mode of operation of SIP session-timers feature in
188 Asterisk. The Asterisk can be configured in one of the following three modes:
190 1. Accept :: In the "accept" mode, the Asterisk server honors session-timers requests
191 made by remote end-points. A remote end-point can request Asterisk to engage
192 session-timers by either sending it an INVITE request with a "Supported: timer"
193 header in it or by responding to Asterisk's INVITE with a 200 OK that contains
194 Session-Expires: header in it. In this mode, the Asterisk server does not
195 request session-timers from remote end-points. This is the default mode.
196 2. Originate :: In the "originate" mode, the Asterisk server requests the remote
197 end-points to activate session-timers in addition to honoring such requests
198 made by the remote end-pints. In order to get as much protection as possible
199 against hanging SIP channels due to network or end-point failures, Asterisk
200 resends periodic re-INVITEs even if a remote end-point does not support
201 the session-timers feature.
202 3. Refuse :: In the "refuse" mode, Asterisk acts as if it does not support session-
203 timers for inbound or outbound requests. If a remote end-point requests
204 session-timers in a dialog, then Asterisk ignores that request unless it's
205 noted as a requirement (Require: header), in which case the INVITE is
206 rejected with a 420 Bad Extension response.
210 #include "asterisk.h"
212 ASTERISK_FILE_VERSION(__FILE__, "$Revision$")
215 #include <sys/ioctl.h>
218 #include <sys/signal.h>
222 #include "asterisk/network.h"
223 #include "asterisk/paths.h" /* need ast_config_AST_SYSTEM_NAME */
225 #include "asterisk/lock.h"
226 #include "asterisk/channel.h"
227 #include "asterisk/config.h"
228 #include "asterisk/module.h"
229 #include "asterisk/pbx.h"
230 #include "asterisk/sched.h"
231 #include "asterisk/io.h"
232 #include "asterisk/rtp_engine.h"
233 #include "asterisk/udptl.h"
234 #include "asterisk/acl.h"
235 #include "asterisk/manager.h"
236 #include "asterisk/callerid.h"
237 #include "asterisk/cli.h"
238 #include "asterisk/app.h"
239 #include "asterisk/musiconhold.h"
240 #include "asterisk/dsp.h"
241 #include "asterisk/features.h"
242 #include "asterisk/srv.h"
243 #include "asterisk/astdb.h"
244 #include "asterisk/causes.h"
245 #include "asterisk/utils.h"
246 #include "asterisk/file.h"
247 #include "asterisk/astobj.h"
249 Uncomment the define below, if you are having refcount related memory leaks.
250 With this uncommented, this module will generate a file, /tmp/refs, which contains
251 a history of the ao2_ref() calls. To be useful, all calls to ao2_* functions should
252 be modified to ao2_t_* calls, and include a tag describing what is happening with
253 enough detail, to make pairing up a reference count increment with its corresponding decrement.
254 The refcounter program in utils/ can be invaluable in highlighting objects that are not
255 balanced, along with the complete history for that object.
256 In normal operation, the macros defined will throw away the tags, so they do not
257 affect the speed of the program at all. They can be considered to be documentation.
259 /* #define REF_DEBUG 1 */
260 #include "asterisk/astobj2.h"
261 #include "asterisk/dnsmgr.h"
262 #include "asterisk/devicestate.h"
263 #include "asterisk/linkedlists.h"
264 #include "asterisk/stringfields.h"
265 #include "asterisk/monitor.h"
266 #include "asterisk/netsock.h"
267 #include "asterisk/localtime.h"
268 #include "asterisk/abstract_jb.h"
269 #include "asterisk/threadstorage.h"
270 #include "asterisk/translate.h"
271 #include "asterisk/ast_version.h"
272 #include "asterisk/event.h"
273 #include "asterisk/tcptls.h"
274 #include "asterisk/stun.h"
275 #include "asterisk/cel.h"
278 <application name="SIPDtmfMode" language="en_US">
280 Change the dtmfmode for a SIP call.
283 <parameter name="mode" required="true">
285 <enum name="inband" />
287 <enum name="rfc2833" />
292 <para>Changes the dtmfmode for a SIP call.</para>
295 <application name="SIPAddHeader" language="en_US">
297 Add a SIP header to the outbound call.
300 <parameter name="Header" required="true" />
301 <parameter name="Content" required="true" />
304 <para>Adds a header to a SIP call placed with DIAL.</para>
305 <para>Remember to use the X-header if you are adding non-standard SIP
306 headers, like <literal>X-Asterisk-Accountcode:</literal>. Use this with care.
307 Adding the wrong headers may jeopardize the SIP dialog.</para>
308 <para>Always returns <literal>0</literal>.</para>
311 <application name="SIPRemoveHeader" language="en_US">
313 Remove SIP headers previously added with SIPAddHeader
316 <parameter name="Header" required="false" />
319 <para>SIPRemoveHeader() allows you to remove headers which were previously
320 added with SIPAddHeader(). If no parameter is supplied, all previously added
321 headers will be removed. If a parameter is supplied, only the matching headers
322 will be removed.</para>
323 <para>For example you have added these 2 headers:</para>
324 <para>SIPAddHeader(P-Asserted-Identity: sip:foo@bar);</para>
325 <para>SIPAddHeader(P-Preferred-Identity: sip:bar@foo);</para>
327 <para>// remove all headers</para>
328 <para>SIPRemoveHeader();</para>
329 <para>// remove all P- headers</para>
330 <para>SIPRemoveHeader(P-);</para>
331 <para>// remove only the PAI header (note the : at the end)</para>
332 <para>SIPRemoveHeader(P-Asserted-Identity:);</para>
334 <para>Always returns <literal>0</literal>.</para>
337 <function name="SIP_HEADER" language="en_US">
339 Gets the specified SIP header.
342 <parameter name="name" required="true" />
343 <parameter name="number">
344 <para>If not specified, defaults to <literal>1</literal>.</para>
348 <para>Since there are several headers (such as Via) which can occur multiple
349 times, SIP_HEADER takes an optional second argument to specify which header with
350 that name to retrieve. Headers start at offset <literal>1</literal>.</para>
353 <function name="SIPPEER" language="en_US">
355 Gets SIP peer information.
358 <parameter name="peername" required="true" />
359 <parameter name="item">
362 <para>(default) The ip address.</para>
365 <para>The port number.</para>
367 <enum name="mailbox">
368 <para>The configured mailbox.</para>
370 <enum name="context">
371 <para>The configured context.</para>
374 <para>The epoch time of the next expire.</para>
376 <enum name="dynamic">
377 <para>Is it dynamic? (yes/no).</para>
379 <enum name="callerid_name">
380 <para>The configured Caller ID name.</para>
382 <enum name="callerid_num">
383 <para>The configured Caller ID number.</para>
385 <enum name="callgroup">
386 <para>The configured Callgroup.</para>
388 <enum name="pickupgroup">
389 <para>The configured Pickupgroup.</para>
392 <para>The configured codecs.</para>
395 <para>Status (if qualify=yes).</para>
397 <enum name="regexten">
398 <para>Registration extension.</para>
401 <para>Call limit (call-limit).</para>
403 <enum name="busylevel">
404 <para>Configured call level for signalling busy.</para>
406 <enum name="curcalls">
407 <para>Current amount of calls. Only available if call-limit is set.</para>
409 <enum name="language">
410 <para>Default language for peer.</para>
412 <enum name="accountcode">
413 <para>Account code for this peer.</para>
415 <enum name="useragent">
416 <para>Current user agent id for peer.</para>
418 <enum name="chanvar[name]">
419 <para>A channel variable configured with setvar for this peer.</para>
421 <enum name="codec[x]">
422 <para>Preferred codec index number <replaceable>x</replaceable> (beginning with zero).</para>
429 <function name="SIPCHANINFO" language="en_US">
431 Gets the specified SIP parameter from the current channel.
434 <parameter name="item" required="true">
437 <para>The IP address of the peer.</para>
440 <para>The source IP address of the peer.</para>
443 <para>The URI from the <literal>From:</literal> header.</para>
446 <para>The URI from the <literal>Contact:</literal> header.</para>
448 <enum name="useragent">
449 <para>The useragent.</para>
451 <enum name="peername">
452 <para>The name of the peer.</para>
454 <enum name="t38passthrough">
455 <para><literal>1</literal> if T38 is offered or enabled in this channel,
456 otherwise <literal>0</literal>.</para>
463 <function name="CHECKSIPDOMAIN" language="en_US">
465 Checks if domain is a local domain.
468 <parameter name="domain" required="true" />
471 <para>This function checks if the <replaceable>domain</replaceable> in the argument is configured
472 as a local SIP domain that this Asterisk server is configured to handle.
473 Returns the domain name if it is locally handled, otherwise an empty string.
474 Check the <literal>domain=</literal> configuration in <filename>sip.conf</filename>.</para>
477 <manager name="SIPpeers" language="en_US">
479 List SIP peers (text format).
482 <xi:include xpointer="xpointer(/docs/manager[@name='Login']/syntax/parameter[@name='ActionID'])" />
485 <para>Lists SIP peers in text format with details on current status.
486 Peerlist will follow as separate events, followed by a final event called
487 PeerlistComplete.</para>
490 <manager name="SIPshowpeer" language="en_US">
492 show SIP peer (text format).
495 <xi:include xpointer="xpointer(/docs/manager[@name='Login']/syntax/parameter[@name='ActionID'])" />
496 <parameter name="Peer" required="true">
497 <para>The peer name you want to check.</para>
501 <para>Show one SIP peer with details on current status.</para>
504 <manager name="SIPqualifypeer" language="en_US">
509 <xi:include xpointer="xpointer(/docs/manager[@name='Login']/syntax/parameter[@name='ActionID'])" />
510 <parameter name="Peer" required="true">
511 <para>The peer name you want to qualify.</para>
515 <para>Qualify a SIP peer.</para>
518 <manager name="SIPshowregistry" language="en_US">
520 Show SIP registrations (text format).
523 <xi:include xpointer="xpointer(/docs/manager[@name='Login']/syntax/parameter[@name='ActionID'])" />
526 <para>Lists all registration requests and status. Registrations will follow as separate
527 events. followed by a final event called RegistrationsComplete.</para>
530 <manager name="SIPnotify" language="en_US">
535 <xi:include xpointer="xpointer(/docs/manager[@name='Login']/syntax/parameter[@name='ActionID'])" />
536 <parameter name="Channel" required="true">
537 <para>Peer to receive the notify.</para>
539 <parameter name="Variable" required="true">
540 <para>At least one variable pair must be specified.
541 <replaceable>name</replaceable>=<replaceable>value</replaceable></para>
545 <para>Sends a SIP Notify event.</para>
546 <para>All parameters for this event must be specified in the body of this request
547 via multiple Variable: name=value sequences.</para>
560 /* Arguments for find_peer */
561 #define FINDUSERS (1 << 0)
562 #define FINDPEERS (1 << 1)
563 #define FINDALLDEVICES (FINDUSERS | FINDPEERS)
565 #define SIPBUFSIZE 512 /*!< Buffer size for many operations */
567 #define XMIT_ERROR -2
569 #define SIP_RESERVED ";/?:@&=+$,# " /*!< Reserved characters in the username part of the URI */
571 /* #define VOCAL_DATA_HACK */
573 #define DEFAULT_DEFAULT_EXPIRY 120
574 #define DEFAULT_MIN_EXPIRY 60
575 #define DEFAULT_MAX_EXPIRY 3600
576 #define DEFAULT_MWI_EXPIRY 3600
577 #define DEFAULT_REGISTRATION_TIMEOUT 20
578 #define DEFAULT_MAX_FORWARDS "70"
580 /* guard limit must be larger than guard secs */
581 /* guard min must be < 1000, and should be >= 250 */
582 #define EXPIRY_GUARD_SECS 15 /*!< How long before expiry do we reregister */
583 #define EXPIRY_GUARD_LIMIT 30 /*!< Below here, we use EXPIRY_GUARD_PCT instead of
585 #define EXPIRY_GUARD_MIN 500 /*!< This is the minimum guard time applied. If
586 GUARD_PCT turns out to be lower than this, it
587 will use this time instead.
588 This is in milliseconds. */
589 #define EXPIRY_GUARD_PCT 0.20 /*!< Percentage of expires timeout to use when
590 below EXPIRY_GUARD_LIMIT */
591 #define DEFAULT_EXPIRY 900 /*!< Expire slowly */
593 static int min_expiry = DEFAULT_MIN_EXPIRY; /*!< Minimum accepted registration time */
594 static int max_expiry = DEFAULT_MAX_EXPIRY; /*!< Maximum accepted registration time */
595 static int default_expiry = DEFAULT_DEFAULT_EXPIRY;
596 static int mwi_expiry = DEFAULT_MWI_EXPIRY;
598 #define DEFAULT_QUALIFY_GAP 100
599 #define DEFAULT_QUALIFY_PEERS 1
602 #define CALLERID_UNKNOWN "Anonymous"
603 #define FROMDOMAIN_INVALID "anonymous.invalid"
605 #define DEFAULT_MAXMS 2000 /*!< Qualification: Must be faster than 2 seconds by default */
606 #define DEFAULT_QUALIFYFREQ 60 * 1000 /*!< Qualification: How often to check for the host to be up */
607 #define DEFAULT_FREQ_NOTOK 10 * 1000 /*!< Qualification: How often to check, if the host is down... */
609 #define DEFAULT_RETRANS 1000 /*!< How frequently to retransmit Default: 2 * 500 ms in RFC 3261 */
610 #define MAX_RETRANS 6 /*!< Try only 6 times for retransmissions, a total of 7 transmissions */
611 #define DEFAULT_TIMER_T1 500 /*!< SIP timer T1 (according to RFC 3261) */
612 #define SIP_TRANS_TIMEOUT 64 * DEFAULT_TIMER_T1 /*!< SIP request timeout (rfc 3261) 64*T1
613 \todo Use known T1 for timeout (peerpoke)
615 #define DEFAULT_TRANS_TIMEOUT -1 /*!< Use default SIP transaction timeout */
616 #define MAX_AUTHTRIES 3 /*!< Try authentication three times, then fail */
618 #define SIP_MAX_HEADERS 64 /*!< Max amount of SIP headers to read */
619 #define SIP_MAX_LINES 64 /*!< Max amount of lines in SIP attachment (like SDP) */
620 #define SIP_MIN_PACKET 4096 /*!< Initialize size of memory to allocate for packets */
621 #define MAX_HISTORY_ENTRIES 50 /*!< Max entires in the history list for a sip_pvt */
623 #define INITIAL_CSEQ 101 /*!< Our initial sip sequence number */
625 #define DEFAULT_MAX_SE 1800 /*!< Session-Timer Default Session-Expires period (RFC 4028) */
626 #define DEFAULT_MIN_SE 90 /*!< Session-Timer Default Min-SE period (RFC 4028) */
628 #define SDP_MAX_RTPMAP_CODECS 32 /*!< Maximum number of codecs allowed in received SDP */
630 /*! \brief Global jitterbuffer configuration - by default, jb is disabled */
631 static struct ast_jb_conf default_jbconf =
635 .resync_threshold = -1,
638 static struct ast_jb_conf global_jbconf; /*!< Global jitterbuffer configuration */
640 static const char config[] = "sip.conf"; /*!< Main configuration file */
641 static const char notify_config[] = "sip_notify.conf"; /*!< Configuration file for sending Notify with CLI commands to reconfigure or reboot phones */
646 /*! \brief Authorization scheme for call transfers
648 \note Not a bitfield flag, since there are plans for other modes,
649 like "only allow transfers for authenticated devices" */
651 TRANSFER_OPENFORALL, /*!< Allow all SIP transfers */
652 TRANSFER_CLOSED, /*!< Allow no SIP transfers */
656 /*! \brief The result of a lot of functions */
658 AST_SUCCESS = 0, /*!< FALSE means success, funny enough */
659 AST_FAILURE = -1, /*!< Failure code */
662 /*! \brief States for the INVITE transaction, not the dialog
663 \note this is for the INVITE that sets up the dialog
666 INV_NONE = 0, /*!< No state at all, maybe not an INVITE dialog */
667 INV_CALLING = 1, /*!< Invite sent, no answer */
668 INV_PROCEEDING = 2, /*!< We got/sent 1xx message */
669 INV_EARLY_MEDIA = 3, /*!< We got 18x message with to-tag back */
670 INV_COMPLETED = 4, /*!< Got final response with error. Wait for ACK, then CONFIRMED */
671 INV_CONFIRMED = 5, /*!< Confirmed response - we've got an ack (Incoming calls only) */
672 INV_TERMINATED = 6, /*!< Transaction done - either successful (AST_STATE_UP) or failed, but done
673 The only way out of this is a BYE from one side */
674 INV_CANCELLED = 7, /*!< Transaction cancelled by client or server in non-terminated state */
677 /*! \brief Readable descriptions of device states.
678 \note Should be aligned to above table as index */
679 static const struct invstate2stringtable {
680 const enum invitestates state;
682 } invitestate2string[] = {
684 {INV_CALLING, "Calling (Trying)"},
685 {INV_PROCEEDING, "Proceeding "},
686 {INV_EARLY_MEDIA, "Early media"},
687 {INV_COMPLETED, "Completed (done)"},
688 {INV_CONFIRMED, "Confirmed (up)"},
689 {INV_TERMINATED, "Done"},
690 {INV_CANCELLED, "Cancelled"}
693 /*! \brief When sending a SIP message, we can send with a few options, depending on
694 type of SIP request. UNRELIABLE is moslty used for responses to repeated requests,
695 where the original response would be sent RELIABLE in an INVITE transaction */
697 XMIT_CRITICAL = 2, /*!< Transmit critical SIP message reliably, with re-transmits.
698 If it fails, it's critical and will cause a teardown of the session */
699 XMIT_RELIABLE = 1, /*!< Transmit SIP message reliably, with re-transmits */
700 XMIT_UNRELIABLE = 0, /*!< Transmit SIP message without bothering with re-transmits */
703 /*! \brief Results from the parse_register() function */
704 enum parse_register_result {
705 PARSE_REGISTER_FAILED,
706 PARSE_REGISTER_UPDATE,
707 PARSE_REGISTER_QUERY,
710 /*! \brief Type of subscription, based on the packages we do support, see \ref subscription_types */
711 enum subscriptiontype {
720 /*! \brief Subscription types that we support. We support
721 - dialoginfo updates (really device status, not dialog info as was the original intent of the standard)
722 - SIMPLE presence used for device status
723 - Voicemail notification subscriptions
725 static const struct cfsubscription_types {
726 enum subscriptiontype type;
727 const char * const event;
728 const char * const mediatype;
729 const char * const text;
730 } subscription_types[] = {
731 { NONE, "-", "unknown", "unknown" },
732 /* RFC 4235: SIP Dialog event package */
733 { DIALOG_INFO_XML, "dialog", "application/dialog-info+xml", "dialog-info+xml" },
734 { CPIM_PIDF_XML, "presence", "application/cpim-pidf+xml", "cpim-pidf+xml" }, /* RFC 3863 */
735 { PIDF_XML, "presence", "application/pidf+xml", "pidf+xml" }, /* RFC 3863 */
736 { XPIDF_XML, "presence", "application/xpidf+xml", "xpidf+xml" }, /* Pre-RFC 3863 with MS additions */
737 { MWI_NOTIFICATION, "message-summary", "application/simple-message-summary", "mwi" } /* RFC 3842: Mailbox notification */
741 /*! \brief Authentication types - proxy or www authentication
742 \note Endpoints, like Asterisk, should always use WWW authentication to
743 allow multiple authentications in the same call - to the proxy and
751 /*! \brief Authentication result from check_auth* functions */
752 enum check_auth_result {
753 AUTH_DONT_KNOW = -100, /*!< no result, need to check further */
754 /* XXX maybe this is the same as AUTH_NOT_FOUND */
757 AUTH_CHALLENGE_SENT = 1,
758 AUTH_SECRET_FAILED = -1,
759 AUTH_USERNAME_MISMATCH = -2,
760 AUTH_NOT_FOUND = -3, /*!< returned by register_verify */
762 AUTH_UNKNOWN_DOMAIN = -5,
763 AUTH_PEER_NOT_DYNAMIC = -6,
764 AUTH_ACL_FAILED = -7,
765 AUTH_BAD_TRANSPORT = -8,
769 /*! \brief States for outbound registrations (with register= lines in sip.conf */
770 enum sipregistrystate {
771 REG_STATE_UNREGISTERED = 0, /*!< We are not registered
772 * \note Initial state. We should have a timeout scheduled for the initial
773 * (or next) registration transmission, calling sip_reregister
776 REG_STATE_REGSENT, /*!< Registration request sent
777 * \note sent initial request, waiting for an ack or a timeout to
778 * retransmit the initial request.
781 REG_STATE_AUTHSENT, /*!< We have tried to authenticate
782 * \note entered after transmit_register with auth info,
783 * waiting for an ack.
786 REG_STATE_REGISTERED, /*!< Registered and done */
788 REG_STATE_REJECTED, /*!< Registration rejected *
789 * \note only used when the remote party has an expire larger than
790 * our max-expire. This is a final state from which we do not
791 * recover (not sure how correctly).
794 REG_STATE_TIMEOUT, /*!< Registration timed out *
795 * \note XXX unused */
797 REG_STATE_NOAUTH, /*!< We have no accepted credentials
798 * \note fatal - no chance to proceed */
800 REG_STATE_FAILED, /*!< Registration failed after several tries
801 * \note fatal - no chance to proceed */
804 /*! \brief Modes in which Asterisk can be configured to run SIP Session-Timers */
806 SESSION_TIMER_MODE_INVALID = 0, /*!< Invalid value */
807 SESSION_TIMER_MODE_ACCEPT, /*!< Honor inbound Session-Timer requests */
808 SESSION_TIMER_MODE_ORIGINATE, /*!< Originate outbound and honor inbound requests */
809 SESSION_TIMER_MODE_REFUSE /*!< Ignore inbound Session-Timers requests */
812 /*! \brief The entity playing the refresher role for Session-Timers */
814 SESSION_TIMER_REFRESHER_AUTO, /*!< Negotiated */
815 SESSION_TIMER_REFRESHER_UAC, /*!< Session is refreshed by the UAC */
816 SESSION_TIMER_REFRESHER_UAS /*!< Session is refreshed by the UAS */
819 /*! \brief Define some implemented SIP transports
820 \note Asterisk does not support SCTP or UDP/DTLS
823 SIP_TRANSPORT_UDP = 1, /*!< Unreliable transport for SIP, needs retransmissions */
824 SIP_TRANSPORT_TCP = 1 << 1, /*!< Reliable, but unsecure */
825 SIP_TRANSPORT_TLS = 1 << 2, /*!< TCP/TLS - reliable and secure transport for signalling */
828 /*! \brief definition of a sip proxy server
830 * For outbound proxies, a sip_peer will contain a reference to a
831 * dynamically allocated instance of a sip_proxy. A sip_pvt may also
832 * contain a reference to a peer's outboundproxy, or it may contain
833 * a reference to the sip_cfg.outboundproxy.
836 char name[MAXHOSTNAMELEN]; /*!< DNS name of domain/host or IP */
837 struct sockaddr_in ip; /*!< Currently used IP address and port */
838 time_t last_dnsupdate; /*!< When this was resolved */
839 enum sip_transport transport;
840 int force; /*!< If it's an outbound proxy, Force use of this outbound proxy for all outbound requests */
841 /* Room for a SRV record chain based on the name */
844 /*! \brief argument for the 'show channels|subscriptions' callback. */
845 struct __show_chan_arg {
848 int numchans; /* return value */
852 /*! \brief States whether a SIP message can create a dialog in Asterisk. */
853 enum can_create_dialog {
854 CAN_NOT_CREATE_DIALOG,
856 CAN_CREATE_DIALOG_UNSUPPORTED_METHOD,
859 /*! \brief SIP Request methods known by Asterisk
861 \note Do _NOT_ make any changes to this enum, or the array following it;
862 if you think you are doing the right thing, you are probably
863 not doing the right thing. If you think there are changes
864 needed, get someone else to review them first _before_
865 submitting a patch. If these two lists do not match properly
866 bad things will happen.
870 SIP_UNKNOWN, /*!< Unknown response */
871 SIP_RESPONSE, /*!< Not request, response to outbound request */
872 SIP_REGISTER, /*!< Registration to the mothership, tell us where you are located */
873 SIP_OPTIONS, /*!< Check capabilities of a device, used for "ping" too */
874 SIP_NOTIFY, /*!< Status update, Part of the event package standard, result of a SUBSCRIBE or a REFER */
875 SIP_INVITE, /*!< Set up a session */
876 SIP_ACK, /*!< End of a three-way handshake started with INVITE. */
877 SIP_PRACK, /*!< Reliable pre-call signalling. Not supported in Asterisk. */
878 SIP_BYE, /*!< End of a session */
879 SIP_REFER, /*!< Refer to another URI (transfer) */
880 SIP_SUBSCRIBE, /*!< Subscribe for updates (voicemail, session status, device status, presence) */
881 SIP_MESSAGE, /*!< Text messaging */
882 SIP_UPDATE, /*!< Update a dialog. We can send UPDATE; but not accept it */
883 SIP_INFO, /*!< Information updates during a session */
884 SIP_CANCEL, /*!< Cancel an INVITE */
885 SIP_PUBLISH, /*!< Not supported in Asterisk */
886 SIP_PING, /*!< Not supported at all, no standard but still implemented out there */
889 /*! \brief Settings for the 'notifycid' option, see sip.conf.sample for details. */
890 enum notifycid_setting {
896 /*! \brief The core structure to setup dialogs. We parse incoming messages by using
897 structure and then route the messages according to the type.
899 \note Note that sip_methods[i].id == i must hold or the code breaks */
900 static const struct cfsip_methods {
902 int need_rtp; /*!< when this is the 'primary' use for a pvt structure, does it need RTP? */
904 enum can_create_dialog can_create;
906 { SIP_UNKNOWN, RTP, "-UNKNOWN-", CAN_CREATE_DIALOG },
907 { SIP_RESPONSE, NO_RTP, "SIP/2.0", CAN_NOT_CREATE_DIALOG },
908 { SIP_REGISTER, NO_RTP, "REGISTER", CAN_CREATE_DIALOG },
909 { SIP_OPTIONS, NO_RTP, "OPTIONS", CAN_CREATE_DIALOG },
910 { SIP_NOTIFY, NO_RTP, "NOTIFY", CAN_CREATE_DIALOG },
911 { SIP_INVITE, RTP, "INVITE", CAN_CREATE_DIALOG },
912 { SIP_ACK, NO_RTP, "ACK", CAN_NOT_CREATE_DIALOG },
913 { SIP_PRACK, NO_RTP, "PRACK", CAN_NOT_CREATE_DIALOG },
914 { SIP_BYE, NO_RTP, "BYE", CAN_NOT_CREATE_DIALOG },
915 { SIP_REFER, NO_RTP, "REFER", CAN_CREATE_DIALOG },
916 { SIP_SUBSCRIBE, NO_RTP, "SUBSCRIBE", CAN_CREATE_DIALOG },
917 { SIP_MESSAGE, NO_RTP, "MESSAGE", CAN_CREATE_DIALOG },
918 { SIP_UPDATE, NO_RTP, "UPDATE", CAN_NOT_CREATE_DIALOG },
919 { SIP_INFO, NO_RTP, "INFO", CAN_NOT_CREATE_DIALOG },
920 { SIP_CANCEL, NO_RTP, "CANCEL", CAN_NOT_CREATE_DIALOG },
921 { SIP_PUBLISH, NO_RTP, "PUBLISH", CAN_CREATE_DIALOG_UNSUPPORTED_METHOD },
922 { SIP_PING, NO_RTP, "PING", CAN_CREATE_DIALOG_UNSUPPORTED_METHOD }
925 /*! Define SIP option tags, used in Require: and Supported: headers
926 We need to be aware of these properties in the phones to use
927 the replace: header. We should not do that without knowing
928 that the other end supports it...
929 This is nothing we can configure, we learn by the dialog
930 Supported: header on the REGISTER (peer) or the INVITE
932 We are not using many of these today, but will in the future.
933 This is documented in RFC 3261
936 #define NOT_SUPPORTED 0
939 #define SIP_OPT_REPLACES (1 << 0)
940 #define SIP_OPT_100REL (1 << 1)
941 #define SIP_OPT_TIMER (1 << 2)
942 #define SIP_OPT_EARLY_SESSION (1 << 3)
943 #define SIP_OPT_JOIN (1 << 4)
944 #define SIP_OPT_PATH (1 << 5)
945 #define SIP_OPT_PREF (1 << 6)
946 #define SIP_OPT_PRECONDITION (1 << 7)
947 #define SIP_OPT_PRIVACY (1 << 8)
948 #define SIP_OPT_SDP_ANAT (1 << 9)
949 #define SIP_OPT_SEC_AGREE (1 << 10)
950 #define SIP_OPT_EVENTLIST (1 << 11)
951 #define SIP_OPT_GRUU (1 << 12)
952 #define SIP_OPT_TARGET_DIALOG (1 << 13)
953 #define SIP_OPT_NOREFERSUB (1 << 14)
954 #define SIP_OPT_HISTINFO (1 << 15)
955 #define SIP_OPT_RESPRIORITY (1 << 16)
956 #define SIP_OPT_FROMCHANGE (1 << 17)
957 #define SIP_OPT_RECLISTINV (1 << 18)
958 #define SIP_OPT_RECLISTSUB (1 << 19)
959 #define SIP_OPT_OUTBOUND (1 << 20)
960 #define SIP_OPT_UNKNOWN (1 << 21)
963 /*! \brief List of well-known SIP options. If we get this in a require,
964 we should check the list and answer accordingly. */
965 static const struct cfsip_options {
966 int id; /*!< Bitmap ID */
967 int supported; /*!< Supported by Asterisk ? */
968 char * const text; /*!< Text id, as in standard */
969 } sip_options[] = { /* XXX used in 3 places */
970 /* RFC3262: PRACK 100% reliability */
971 { SIP_OPT_100REL, NOT_SUPPORTED, "100rel" },
972 /* RFC3959: SIP Early session support */
973 { SIP_OPT_EARLY_SESSION, NOT_SUPPORTED, "early-session" },
974 /* SIMPLE events: RFC4662 */
975 { SIP_OPT_EVENTLIST, NOT_SUPPORTED, "eventlist" },
976 /* RFC 4916- Connected line ID updates */
977 { SIP_OPT_FROMCHANGE, NOT_SUPPORTED, "from-change" },
978 /* GRUU: Globally Routable User Agent URI's */
979 { SIP_OPT_GRUU, NOT_SUPPORTED, "gruu" },
980 /* RFC4244 History info */
981 { SIP_OPT_HISTINFO, NOT_SUPPORTED, "histinfo" },
982 /* RFC3911: SIP Join header support */
983 { SIP_OPT_JOIN, NOT_SUPPORTED, "join" },
984 /* Disable the REFER subscription, RFC 4488 */
985 { SIP_OPT_NOREFERSUB, NOT_SUPPORTED, "norefersub" },
986 /* SIP outbound - the final NAT battle - draft-sip-outbound */
987 { SIP_OPT_OUTBOUND, NOT_SUPPORTED, "outbound" },
988 /* RFC3327: Path support */
989 { SIP_OPT_PATH, NOT_SUPPORTED, "path" },
990 /* RFC3840: Callee preferences */
991 { SIP_OPT_PREF, NOT_SUPPORTED, "pref" },
992 /* RFC3312: Precondition support */
993 { SIP_OPT_PRECONDITION, NOT_SUPPORTED, "precondition" },
994 /* RFC3323: Privacy with proxies*/
995 { SIP_OPT_PRIVACY, NOT_SUPPORTED, "privacy" },
996 /* RFC-ietf-sip-uri-list-conferencing-02.txt conference invite lists */
997 { SIP_OPT_RECLISTINV, NOT_SUPPORTED, "recipient-list-invite" },
998 /* RFC-ietf-sip-uri-list-subscribe-02.txt - subscription lists */
999 { SIP_OPT_RECLISTSUB, NOT_SUPPORTED, "recipient-list-subscribe" },
1000 /* RFC3891: Replaces: header for transfer */
1001 { SIP_OPT_REPLACES, SUPPORTED, "replaces" },
1002 /* One version of Polycom firmware has the wrong label */
1003 { SIP_OPT_REPLACES, SUPPORTED, "replace" },
1004 /* RFC4412 Resource priorities */
1005 { SIP_OPT_RESPRIORITY, NOT_SUPPORTED, "resource-priority" },
1006 /* RFC3329: Security agreement mechanism */
1007 { SIP_OPT_SEC_AGREE, NOT_SUPPORTED, "sec_agree" },
1008 /* RFC4092: Usage of the SDP ANAT Semantics in the SIP */
1009 { SIP_OPT_SDP_ANAT, NOT_SUPPORTED, "sdp-anat" },
1010 /* RFC4028: SIP Session-Timers */
1011 { SIP_OPT_TIMER, SUPPORTED, "timer" },
1012 /* RFC4538: Target-dialog */
1013 { SIP_OPT_TARGET_DIALOG,NOT_SUPPORTED, "tdialog" },
1016 /*! \brief Diversion header reasons
1018 * The core defines a bunch of constants used to define
1019 * redirecting reasons. This provides a translation table
1020 * between those and the strings which may be present in
1021 * a SIP Diversion header
1023 static const struct sip_reasons {
1024 enum AST_REDIRECTING_REASON code;
1026 } sip_reason_table[] = {
1027 { AST_REDIRECTING_REASON_UNKNOWN, "unknown" },
1028 { AST_REDIRECTING_REASON_USER_BUSY, "user-busy" },
1029 { AST_REDIRECTING_REASON_NO_ANSWER, "no-answer" },
1030 { AST_REDIRECTING_REASON_UNAVAILABLE, "unavailable" },
1031 { AST_REDIRECTING_REASON_UNCONDITIONAL, "unconditional" },
1032 { AST_REDIRECTING_REASON_TIME_OF_DAY, "time-of-day" },
1033 { AST_REDIRECTING_REASON_DO_NOT_DISTURB, "do-not-disturb" },
1034 { AST_REDIRECTING_REASON_DEFLECTION, "deflection" },
1035 { AST_REDIRECTING_REASON_FOLLOW_ME, "follow-me" },
1036 { AST_REDIRECTING_REASON_OUT_OF_ORDER, "out-of-service" },
1037 { AST_REDIRECTING_REASON_AWAY, "away" },
1038 { AST_REDIRECTING_REASON_CALL_FWD_DTE, "unknown"}
1041 static enum AST_REDIRECTING_REASON sip_reason_str_to_code(const char *text)
1043 enum AST_REDIRECTING_REASON ast = AST_REDIRECTING_REASON_UNKNOWN;
1046 for (i = 0; i < ARRAY_LEN(sip_reason_table); ++i) {
1047 if (!strcasecmp(text, sip_reason_table[i].text)) {
1048 ast = sip_reason_table[i].code;
1056 static const char *sip_reason_code_to_str(enum AST_REDIRECTING_REASON code)
1058 if (code >= 0 && code < ARRAY_LEN(sip_reason_table)) {
1059 return sip_reason_table[code].text;
1065 /*! \brief SIP Methods we support
1066 \todo This string should be set dynamically. We only support REFER and SUBSCRIBE if we have
1067 allowsubscribe and allowrefer on in sip.conf.
1069 #define ALLOWED_METHODS "INVITE, ACK, CANCEL, OPTIONS, BYE, REFER, SUBSCRIBE, NOTIFY, INFO"
1071 /*! \brief SIP Extensions we support
1072 \note This should be generated based on the previous array
1073 in combination with settings.
1074 \todo We should not have "timer" if it's disabled in the configuration file.
1076 #define SUPPORTED_EXTENSIONS "replaces, timer"
1078 /*! \brief Standard SIP unsecure port for UDP and TCP from RFC 3261. DO NOT CHANGE THIS */
1079 #define STANDARD_SIP_PORT 5060
1080 /*! \brief Standard SIP TLS port from RFC 3261. DO NOT CHANGE THIS */
1081 #define STANDARD_TLS_PORT 5061
1083 /*! \note in many SIP headers, absence of a port number implies port 5060,
1084 * and this is why we cannot change the above constant.
1085 * There is a limited number of places in asterisk where we could,
1086 * in principle, use a different "default" port number, but
1087 * we do not support this feature at the moment.
1088 * You can run Asterisk with SIP on a different port with a configuration
1089 * option. If you change this value, the signalling will be incorrect.
1092 /*! \name DefaultValues Default values, set and reset in reload_config before reading configuration
1094 These are default values in the source. There are other recommended values in the
1095 sip.conf.sample for new installations. These may differ to keep backwards compatibility,
1096 yet encouraging new behaviour on new installations
1099 #define DEFAULT_CONTEXT "default" /*!< The default context for [general] section as well as devices */
1100 #define DEFAULT_MOHINTERPRET "default" /*!< The default music class */
1101 #define DEFAULT_MOHSUGGEST ""
1102 #define DEFAULT_VMEXTEN "asterisk" /*!< Default voicemail extension */
1103 #define DEFAULT_CALLERID "asterisk" /*!< Default caller ID */
1104 #define DEFAULT_MWI_FROM ""
1105 #define DEFAULT_NOTIFYMIME "application/simple-message-summary"
1106 #define DEFAULT_ALLOWGUEST TRUE
1107 #define DEFAULT_RTPKEEPALIVE 0 /*!< Default RTPkeepalive setting */
1108 #define DEFAULT_CALLCOUNTER FALSE
1109 #define DEFAULT_SRVLOOKUP TRUE /*!< Recommended setting is ON */
1110 #define DEFAULT_COMPACTHEADERS FALSE /*!< Send compact (one-character) SIP headers. Default off */
1111 #define DEFAULT_TOS_SIP 0 /*!< Call signalling packets should be marked as DSCP CS3, but the default is 0 to be compatible with previous versions. */
1112 #define DEFAULT_TOS_AUDIO 0 /*!< Audio packets should be marked as DSCP EF (Expedited Forwarding), but the default is 0 to be compatible with previous versions. */
1113 #define DEFAULT_TOS_VIDEO 0 /*!< Video packets should be marked as DSCP AF41, but the default is 0 to be compatible with previous versions. */
1114 #define DEFAULT_TOS_TEXT 0 /*!< Text packets should be marked as XXXX XXXX, but the default is 0 to be compatible with previous versions. */
1115 #define DEFAULT_COS_SIP 4 /*!< Level 2 class of service for SIP signalling */
1116 #define DEFAULT_COS_AUDIO 5 /*!< Level 2 class of service for audio media */
1117 #define DEFAULT_COS_VIDEO 6 /*!< Level 2 class of service for video media */
1118 #define DEFAULT_COS_TEXT 5 /*!< Level 2 class of service for text media (T.140) */
1119 #define DEFAULT_ALLOW_EXT_DOM TRUE /*!< Allow external domains */
1120 #define DEFAULT_REALM "asterisk" /*!< Realm for HTTP digest authentication */
1121 #define DEFAULT_NOTIFYRINGING TRUE /*!< Notify devicestate system on ringing state */
1122 #define DEFAULT_NOTIFYCID DISABLED /*!< Include CID with ringing notifications */
1123 #define DEFAULT_PEDANTIC FALSE /*!< Avoid following SIP standards for dialog matching */
1124 #define DEFAULT_AUTOCREATEPEER FALSE /*!< Don't create peers automagically */
1125 #define DEFAULT_MATCHEXTERNIPLOCALLY FALSE /*!< Match extern IP locally default setting */
1126 #define DEFAULT_QUALIFY FALSE /*!< Don't monitor devices */
1127 #define DEFAULT_CALLEVENTS FALSE /*!< Extra manager SIP call events */
1128 #define DEFAULT_ALWAYSAUTHREJECT FALSE /*!< Don't reject authentication requests always */
1129 #define DEFAULT_REGEXTENONQUALIFY FALSE
1130 #define DEFAULT_T1MIN 100 /*!< 100 MS for minimal roundtrip time */
1131 #define DEFAULT_MAX_CALL_BITRATE (384) /*!< Max bitrate for video */
1132 #ifndef DEFAULT_USERAGENT
1133 #define DEFAULT_USERAGENT "Asterisk PBX" /*!< Default Useragent: header unless re-defined in sip.conf */
1134 #define DEFAULT_SDPSESSION "Asterisk PBX" /*!< Default SDP session name, (s=) header unless re-defined in sip.conf */
1135 #define DEFAULT_SDPOWNER "root" /*!< Default SDP username field in (o=) header unless re-defined in sip.conf */
1136 #define DEFAULT_ENGINE "asterisk" /*!< Default RTP engine to use for sessions */
1140 /*! \name DefaultSettings
1141 Default setttings are used as a channel setting and as a default when
1145 static char default_language[MAX_LANGUAGE];
1146 static char default_callerid[AST_MAX_EXTENSION];
1147 static char default_mwi_from[80];
1148 static char default_fromdomain[AST_MAX_EXTENSION];
1149 static char default_notifymime[AST_MAX_EXTENSION];
1150 static int default_qualify; /*!< Default Qualify= setting */
1151 static char default_vmexten[AST_MAX_EXTENSION];
1152 static char default_mohinterpret[MAX_MUSICCLASS]; /*!< Global setting for moh class to use when put on hold */
1153 static char default_mohsuggest[MAX_MUSICCLASS]; /*!< Global setting for moh class to suggest when putting
1154 * a bridged channel on hold */
1155 static char default_parkinglot[AST_MAX_CONTEXT]; /*!< Parkinglot */
1156 static char default_engine[256]; /*!< Default RTP engine */
1157 static int default_maxcallbitrate; /*!< Maximum bitrate for call */
1158 static struct ast_codec_pref default_prefs; /*!< Default codec prefs */
1159 static unsigned int default_transports; /*!< Default Transports (enum sip_transport) that are acceptable */
1160 static unsigned int default_primary_transport; /*!< Default primary Transport (enum sip_transport) for outbound connections to devices */
1164 /*! \name GlobalSettings
1165 Global settings apply to the channel (often settings you can change in the general section
1169 /*! \brief a place to store all global settings for the sip channel driver
1170 These are settings that will be possibly to apply on a group level later on.
1171 \note Do not add settings that only apply to the channel itself and can't
1172 be applied to devices (trunks, services, phones)
1174 struct sip_settings {
1175 int peer_rtupdate; /*!< G: Update database with registration data for peer? */
1176 int rtsave_sysname; /*!< G: Save system name at registration? */
1177 int ignore_regexpire; /*!< G: Ignore expiration of peer */
1178 int rtautoclear; /*!< Realtime ?? */
1179 int directrtpsetup; /*!< Enable support for Direct RTP setup (no re-invites) */
1180 int pedanticsipchecking; /*!< Extra checking ? Default off */
1181 int autocreatepeer; /*!< Auto creation of peers at registration? Default off. */
1182 int srvlookup; /*!< SRV Lookup on or off. Default is on */
1183 int allowguest; /*!< allow unauthenticated peers to connect? */
1184 int alwaysauthreject; /*!< Send 401 Unauthorized for all failing requests */
1185 int compactheaders; /*!< send compact sip headers */
1186 int allow_external_domains; /*!< Accept calls to external SIP domains? */
1187 int callevents; /*!< Whether we send manager events or not */
1188 int regextenonqualify; /*!< Whether to add/remove regexten when qualifying peers */
1189 int matchexterniplocally; /*!< Match externip/externhost setting against localnet setting */
1190 unsigned int disallowed_methods; /*!< methods that we should never try to use */
1191 int notifyringing; /*!< Send notifications on ringing */
1192 int notifyhold; /*!< Send notifications on hold */
1193 enum notifycid_setting notifycid; /*!< Send CID with ringing notifications */
1194 enum transfermodes allowtransfer; /*!< SIP Refer restriction scheme */
1195 int allowsubscribe; /*!< Flag for disabling ALL subscriptions, this is FALSE only if all peers are FALSE
1196 the global setting is in globals_flags[1] */
1197 char realm[MAXHOSTNAMELEN]; /*!< Default realm */
1198 struct sip_proxy outboundproxy; /*!< Outbound proxy */
1199 char default_context[AST_MAX_CONTEXT];
1200 char default_subscribecontext[AST_MAX_CONTEXT];
1203 static struct sip_settings sip_cfg;
1205 static int global_match_auth_username; /*!< Match auth username if available instead of From: Default off. */
1207 static int global_relaxdtmf; /*!< Relax DTMF */
1208 static int global_rtptimeout; /*!< Time out call if no RTP */
1209 static int global_rtpholdtimeout; /*!< Time out call if no RTP during hold */
1210 static int global_rtpkeepalive; /*!< Send RTP keepalives */
1211 static int global_reg_timeout;
1212 static int global_regattempts_max; /*!< Registration attempts before giving up */
1213 static int global_callcounter; /*!< Enable call counters for all devices. This is currently enabled by setting the peer
1214 call-limit to 999. When we remove the call-limit from the code, we can make it
1215 with just a boolean flag in the device structure */
1216 static unsigned int global_tos_sip; /*!< IP type of service for SIP packets */
1217 static unsigned int global_tos_audio; /*!< IP type of service for audio RTP packets */
1218 static unsigned int global_tos_video; /*!< IP type of service for video RTP packets */
1219 static unsigned int global_tos_text; /*!< IP type of service for text RTP packets */
1220 static unsigned int global_cos_sip; /*!< 802.1p class of service for SIP packets */
1221 static unsigned int global_cos_audio; /*!< 802.1p class of service for audio RTP packets */
1222 static unsigned int global_cos_video; /*!< 802.1p class of service for video RTP packets */
1223 static unsigned int global_cos_text; /*!< 802.1p class of service for text RTP packets */
1224 static unsigned int recordhistory; /*!< Record SIP history. Off by default */
1225 static unsigned int dumphistory; /*!< Dump history to verbose before destroying SIP dialog */
1226 static char global_regcontext[AST_MAX_CONTEXT]; /*!< Context for auto-extensions */
1227 static char global_useragent[AST_MAX_EXTENSION]; /*!< Useragent for the SIP channel */
1228 static char global_sdpsession[AST_MAX_EXTENSION]; /*!< SDP session name for the SIP channel */
1229 static char global_sdpowner[AST_MAX_EXTENSION]; /*!< SDP owner name for the SIP channel */
1230 static int global_authfailureevents; /*!< Whether we send authentication failure manager events or not. Default no. */
1231 static int global_t1; /*!< T1 time */
1232 static int global_t1min; /*!< T1 roundtrip time minimum */
1233 static int global_timer_b; /*!< Timer B - RFC 3261 Section 17.1.1.2 */
1234 static unsigned int global_autoframing; /*!< Turn autoframing on or off. */
1235 static int global_qualifyfreq; /*!< Qualify frequency */
1236 static int global_qualify_gap; /*!< Time between our group of peer pokes */
1237 static int global_qualify_peers; /*!< Number of peers to poke at a given time */
1240 /*! \brief Codecs that we support by default: */
1241 static int global_capability = AST_FORMAT_ULAW | AST_FORMAT_ALAW | AST_FORMAT_GSM | AST_FORMAT_H263;
1243 static enum st_mode global_st_mode; /*!< Mode of operation for Session-Timers */
1244 static enum st_refresher global_st_refresher; /*!< Session-Timer refresher */
1245 static int global_min_se; /*!< Lowest threshold for session refresh interval */
1246 static int global_max_se; /*!< Highest threshold for session refresh interval */
1250 /*! \brief Global list of addresses dynamic peers are not allowed to use */
1251 static struct ast_ha *global_contact_ha = NULL;
1252 static int global_dynamic_exclude_static = 0;
1254 /*! \name Object counters @{
1255 * \bug These counters are not handled in a thread-safe way ast_atomic_fetchadd_int()
1256 * should be used to modify these values. */
1257 static int speerobjs = 0; /*!< Static peers */
1258 static int rpeerobjs = 0; /*!< Realtime peers */
1259 static int apeerobjs = 0; /*!< Autocreated peer objects */
1260 static int regobjs = 0; /*!< Registry objects */
1263 static struct ast_flags global_flags[2] = {{0}}; /*!< global SIP_ flags */
1264 static char used_context[AST_MAX_CONTEXT]; /*!< name of automatically created context for unloading */
1267 AST_MUTEX_DEFINE_STATIC(netlock);
1269 /*! \brief Protect the monitoring thread, so only one process can kill or start it, and not
1270 when it's doing something critical. */
1271 AST_MUTEX_DEFINE_STATIC(monlock);
1273 AST_MUTEX_DEFINE_STATIC(sip_reload_lock);
1275 /*! \brief This is the thread for the monitor which checks for input on the channels
1276 which are not currently in use. */
1277 static pthread_t monitor_thread = AST_PTHREADT_NULL;
1279 static int sip_reloading = FALSE; /*!< Flag for avoiding multiple reloads at the same time */
1280 static enum channelreloadreason sip_reloadreason; /*!< Reason for last reload/load of configuration */
1282 static struct sched_context *sched; /*!< The scheduling context */
1283 static struct io_context *io; /*!< The IO context */
1284 static int *sipsock_read_id; /*!< ID of IO entry for sipsock FD */
1286 #define DEC_CALL_LIMIT 0
1287 #define INC_CALL_LIMIT 1
1288 #define DEC_CALL_RINGING 2
1289 #define INC_CALL_RINGING 3
1291 /*! \brief The SIP socket definition */
1293 enum sip_transport type; /*!< UDP, TCP or TLS */
1294 int fd; /*!< Filed descriptor, the actual socket */
1296 struct ast_tcptls_session_instance *tcptls_session; /* If tcp or tls, a socket manager */
1299 /*! \brief sip_request: The data grabbed from the UDP socket
1302 * Incoming messages: we first store the data from the socket in data[],
1303 * adding a trailing \0 to make string parsing routines happy.
1304 * Then call parse_request() and req.method = find_sip_method();
1305 * to initialize the other fields. The \r\n at the end of each line is
1306 * replaced by \0, so that data[] is not a conforming SIP message anymore.
1307 * After this processing, rlPart1 is set to non-NULL to remember
1308 * that we can run get_header() on this kind of packet.
1310 * parse_request() splits the first line as follows:
1311 * Requests have in the first line method uri SIP/2.0
1312 * rlPart1 = method; rlPart2 = uri;
1313 * Responses have in the first line SIP/2.0 NNN description
1314 * rlPart1 = SIP/2.0; rlPart2 = NNN + description;
1316 * For outgoing packets, we initialize the fields with init_req() or init_resp()
1317 * (which fills the first line to "METHOD uri SIP/2.0" or "SIP/2.0 code text"),
1318 * and then fill the rest with add_header() and add_line().
1319 * The \r\n at the end of the line are still there, so the get_header()
1320 * and similar functions don't work on these packets.
1323 struct sip_request {
1324 ptrdiff_t rlPart1; /*!< Offset of the SIP Method Name or "SIP/2.0" protocol version */
1325 ptrdiff_t rlPart2; /*!< Offset of the Request URI or Response Status */
1326 int len; /*!< bytes used in data[], excluding trailing null terminator. Rarely used. */
1327 int headers; /*!< # of SIP Headers */
1328 int method; /*!< Method of this request */
1329 int lines; /*!< Body Content */
1330 unsigned int sdp_start; /*!< the line number where the SDP begins */
1331 unsigned int sdp_end; /*!< the line number where the SDP ends */
1332 char debug; /*!< print extra debugging if non zero */
1333 char has_to_tag; /*!< non-zero if packet has To: tag */
1334 char ignore; /*!< if non-zero This is a re-transmit, ignore it */
1335 /* Array of offsets into the request string of each SIP header*/
1336 ptrdiff_t header[SIP_MAX_HEADERS];
1337 /* Array of offsets into the request string of each SDP line*/
1338 ptrdiff_t line[SIP_MAX_LINES];
1339 struct ast_str *data;
1340 /* XXX Do we need to unref socket.ser when the request goes away? */
1341 struct sip_socket socket; /*!< The socket used for this request */
1342 AST_LIST_ENTRY(sip_request) next;
1345 /* \brief given a sip_request and an offset, return the char * that resides there
1347 * It used to be that rlPart1, rlPart2, and the header and line arrays were character
1348 * pointers. They are now offsets into the ast_str portion of the sip_request structure.
1349 * To avoid adding a bunch of redundant pointer arithmetic to the code, this macro is
1350 * provided to retrieve the string at a particular offset within the request's buffer
1352 #define REQ_OFFSET_TO_STR(req,offset) (ast_str_buffer((req)->data) + ((req)->offset))
1354 /*! \brief structure used in transfers */
1356 struct ast_channel *chan1; /*!< First channel involved */
1357 struct ast_channel *chan2; /*!< Second channel involved */
1358 struct sip_request req; /*!< Request that caused the transfer (REFER) */
1359 int seqno; /*!< Sequence number */
1364 /*! \brief Parameters to the transmit_invite function */
1365 struct sip_invite_param {
1366 int addsipheaders; /*!< Add extra SIP headers */
1367 const char *uri_options; /*!< URI options to add to the URI */
1368 const char *vxml_url; /*!< VXML url for Cisco phones */
1369 char *auth; /*!< Authentication */
1370 char *authheader; /*!< Auth header */
1371 enum sip_auth_type auth_type; /*!< Authentication type */
1372 const char *replaces; /*!< Replaces header for call transfers */
1373 int transfer; /*!< Flag - is this Invite part of a SIP transfer? (invite/replaces) */
1376 /*! \brief Structure to save routing information for a SIP session */
1378 struct sip_route *next;
1382 /*! \brief Modes for SIP domain handling in the PBX */
1384 SIP_DOMAIN_AUTO, /*!< This domain is auto-configured */
1385 SIP_DOMAIN_CONFIG, /*!< This domain is from configuration */
1388 /*! \brief Domain data structure.
1389 \note In the future, we will connect this to a configuration tree specific
1393 char domain[MAXHOSTNAMELEN]; /*!< SIP domain we are responsible for */
1394 char context[AST_MAX_EXTENSION]; /*!< Incoming context for this domain */
1395 enum domain_mode mode; /*!< How did we find this domain? */
1396 AST_LIST_ENTRY(domain) list; /*!< List mechanics */
1399 static AST_LIST_HEAD_STATIC(domain_list, domain); /*!< The SIP domain list */
1402 /*! \brief sip_history: Structure for saving transactions within a SIP dialog */
1403 struct sip_history {
1404 AST_LIST_ENTRY(sip_history) list;
1405 char event[0]; /* actually more, depending on needs */
1408 AST_LIST_HEAD_NOLOCK(sip_history_head, sip_history); /*!< history list, entry in sip_pvt */
1410 /*! \brief sip_auth: Credentials for authentication to other SIP services */
1412 char realm[AST_MAX_EXTENSION]; /*!< Realm in which these credentials are valid */
1413 char username[256]; /*!< Username */
1414 char secret[256]; /*!< Secret */
1415 char md5secret[256]; /*!< MD5Secret */
1416 struct sip_auth *next; /*!< Next auth structure in list */
1420 Various flags for the flags field in the pvt structure
1421 Trying to sort these up (one or more of the following):
1425 When flags are used by multiple structures, it is important that
1426 they have a common layout so it is easy to copy them.
1429 #define SIP_OUTGOING (1 << 0) /*!< D: Direction of the last transaction in this dialog */
1430 #define SIP_RINGING (1 << 2) /*!< D: Have sent 180 ringing */
1431 #define SIP_PROGRESS_SENT (1 << 3) /*!< D: Have sent 183 message progress */
1432 #define SIP_NEEDREINVITE (1 << 4) /*!< D: Do we need to send another reinvite? */
1433 #define SIP_PENDINGBYE (1 << 5) /*!< D: Need to send bye after we ack? */
1434 #define SIP_GOTREFER (1 << 6) /*!< D: Got a refer? */
1435 #define SIP_CALL_LIMIT (1 << 7) /*!< D: Call limit enforced for this call */
1436 #define SIP_INC_COUNT (1 << 8) /*!< D: Did this dialog increment the counter of in-use calls? */
1437 #define SIP_INC_RINGING (1 << 9) /*!< D: Did this connection increment the counter of in-use calls? */
1438 #define SIP_DEFER_BYE_ON_TRANSFER (1 << 10) /*!< D: Do not hangup at first ast_hangup */
1440 #define SIP_PROMISCREDIR (1 << 11) /*!< DP: Promiscuous redirection */
1441 #define SIP_TRUSTRPID (1 << 12) /*!< DP: Trust RPID headers? */
1442 #define SIP_USEREQPHONE (1 << 13) /*!< DP: Add user=phone to numeric URI. Default off */
1443 #define SIP_USECLIENTCODE (1 << 14) /*!< DP: Trust X-ClientCode info message */
1445 /* DTMF flags - see str2dtmfmode() and dtmfmode2str() */
1446 #define SIP_DTMF (7 << 15) /*!< DP: DTMF Support: five settings, uses three bits */
1447 #define SIP_DTMF_RFC2833 (0 << 15) /*!< DP: DTMF Support: RTP DTMF - "rfc2833" */
1448 #define SIP_DTMF_INBAND (1 << 15) /*!< DP: DTMF Support: Inband audio, only for ULAW/ALAW - "inband" */
1449 #define SIP_DTMF_INFO (2 << 15) /*!< DP: DTMF Support: SIP Info messages - "info" */
1450 #define SIP_DTMF_AUTO (3 << 15) /*!< DP: DTMF Support: AUTO switch between rfc2833 and in-band DTMF */
1451 #define SIP_DTMF_SHORTINFO (4 << 15) /*!< DP: DTMF Support: SIP Info messages - "info" - short variant */
1454 #define SIP_NAT_FORCE_RPORT (1 << 18) /*!< DP: Force rport even if not present in the request */
1455 #define SIP_NAT_RPORT_PRESENT (1 << 19) /*!< DP: rport was present in the request */
1457 /* re-INVITE related settings */
1458 #define SIP_REINVITE (7 << 20) /*!< DP: four settings, uses three bits */
1459 #define SIP_REINVITE_NONE (0 << 20) /*!< DP: no reinvite allowed */
1460 #define SIP_DIRECT_MEDIA (1 << 20) /*!< DP: allow peers to be reinvited to send media directly p2p */
1461 #define SIP_DIRECT_MEDIA_NAT (2 << 20) /*!< DP: allow media reinvite when new peer is behind NAT */
1462 #define SIP_REINVITE_UPDATE (4 << 20) /*!< DP: use UPDATE (RFC3311) when reinviting this peer */
1464 /* "insecure" settings - see insecure2str() */
1465 #define SIP_INSECURE (3 << 23) /*!< DP: three settings, uses two bits */
1466 #define SIP_INSECURE_NONE (0 << 23) /*!< DP: secure mode */
1467 #define SIP_INSECURE_PORT (1 << 23) /*!< DP: don't require matching port for incoming requests */
1468 #define SIP_INSECURE_INVITE (1 << 24) /*!< DP: don't require authentication for incoming INVITEs */
1470 /* Sending PROGRESS in-band settings */
1471 #define SIP_PROG_INBAND (3 << 25) /*!< DP: three settings, uses two bits */
1472 #define SIP_PROG_INBAND_NEVER (0 << 25)
1473 #define SIP_PROG_INBAND_NO (1 << 25)
1474 #define SIP_PROG_INBAND_YES (2 << 25)
1476 #define SIP_SENDRPID (3 << 29) /*!< DP: Remote Party-ID Support */
1477 #define SIP_SENDRPID_NO (0 << 29)
1478 #define SIP_SENDRPID_PAI (1 << 29) /*!< Use "P-Asserted-Identity" for rpid */
1479 #define SIP_SENDRPID_RPID (2 << 29) /*!< Use "Remote-Party-ID" for rpid */
1480 #define SIP_G726_NONSTANDARD (1 << 31) /*!< DP: Use non-standard packing for G726-32 data */
1482 /*! \brief Flags to copy from peer/user to dialog */
1483 #define SIP_FLAGS_TO_COPY \
1484 (SIP_PROMISCREDIR | SIP_TRUSTRPID | SIP_SENDRPID | SIP_DTMF | SIP_REINVITE | \
1485 SIP_PROG_INBAND | SIP_USECLIENTCODE | SIP_NAT_FORCE_RPORT | SIP_G726_NONSTANDARD | \
1486 SIP_USEREQPHONE | SIP_INSECURE)
1490 a second page of flags (for flags[1] */
1492 /* realtime flags */
1493 #define SIP_PAGE2_RTCACHEFRIENDS (1 << 0) /*!< GP: Should we keep RT objects in memory for extended time? */
1494 #define SIP_PAGE2_RTAUTOCLEAR (1 << 2) /*!< GP: Should we clean memory from peers after expiry? */
1495 #define SIP_PAGE2_RPID_UPDATE (1 << 3)
1496 /* Space for addition of other realtime flags in the future */
1497 #define SIP_PAGE2_SYMMETRICRTP (1 << 8) /*!< GDP: Whether symmetric RTP is enabled or not */
1498 #define SIP_PAGE2_STATECHANGEQUEUE (1 << 9) /*!< D: Unsent state pending change exists */
1500 #define SIP_PAGE2_CONNECTLINEUPDATE_PEND (1 << 10)
1501 #define SIP_PAGE2_RPID_IMMEDIATE (1 << 11)
1502 #define SIP_PAGE2_RPORT_PRESENT (1 << 12) /*!< Was rport received in the Via header? */
1503 #define SIP_PAGE2_PREFERRED_CODEC (1 << 13) /*!< GDP: Only respond with single most preferred joint codec */
1504 #define SIP_PAGE2_VIDEOSUPPORT (1 << 14) /*!< DP: Video supported if offered? */
1505 #define SIP_PAGE2_TEXTSUPPORT (1 << 15) /*!< GDP: Global text enable */
1506 #define SIP_PAGE2_ALLOWSUBSCRIBE (1 << 16) /*!< GP: Allow subscriptions from this peer? */
1507 #define SIP_PAGE2_ALLOWOVERLAP (1 << 17) /*!< DP: Allow overlap dialing ? */
1508 #define SIP_PAGE2_SUBSCRIBEMWIONLY (1 << 18) /*!< GP: Only issue MWI notification if subscribed to */
1509 #define SIP_PAGE2_IGNORESDPVERSION (1 << 19) /*!< GDP: Ignore the SDP session version number we receive and treat all sessions as new */
1511 #define SIP_PAGE2_T38SUPPORT (7 << 20) /*!< GDP: T.38 Fax Support */
1512 #define SIP_PAGE2_T38SUPPORT_UDPTL (1 << 20) /*!< GDP: T.38 Fax Support (no error correction) */
1513 #define SIP_PAGE2_T38SUPPORT_UDPTL_FEC (2 << 20) /*!< GDP: T.38 Fax Support (FEC error correction) */
1514 #define SIP_PAGE2_T38SUPPORT_UDPTL_REDUNDANCY (4 << 20) /*!< GDP: T.38 Fax Support (redundancy error correction) */
1516 #define SIP_PAGE2_CALL_ONHOLD (3 << 23) /*!< D: Call hold states: */
1517 #define SIP_PAGE2_CALL_ONHOLD_ACTIVE (1 << 23) /*!< D: Active hold */
1518 #define SIP_PAGE2_CALL_ONHOLD_ONEDIR (2 << 23) /*!< D: One directional hold */
1519 #define SIP_PAGE2_CALL_ONHOLD_INACTIVE (3 << 23) /*!< D: Inactive hold */
1521 #define SIP_PAGE2_RFC2833_COMPENSATE (1 << 25) /*!< DP: Compensate for buggy RFC2833 implementations */
1522 #define SIP_PAGE2_BUGGY_MWI (1 << 26) /*!< DP: Buggy CISCO MWI fix */
1523 #define SIP_PAGE2_DIALOG_ESTABLISHED (1 << 27) /*!< 29: Has a dialog been established? */
1524 #define SIP_PAGE2_FAX_DETECT (1 << 28) /*!< DP: Fax Detection support */
1525 #define SIP_PAGE2_REGISTERTRYING (1 << 29) /*!< DP: Send 100 Trying on REGISTER attempts */
1526 #define SIP_PAGE2_UDPTL_DESTINATION (1 << 30) /*!< DP: Use source IP of RTP as destination if NAT is enabled */
1527 #define SIP_PAGE2_VIDEOSUPPORT_ALWAYS (1 << 31) /*!< DP: Always set up video, even if endpoints don't support it */
1529 #define SIP_PAGE2_FLAGS_TO_COPY \
1530 (SIP_PAGE2_ALLOWSUBSCRIBE | SIP_PAGE2_ALLOWOVERLAP | SIP_PAGE2_IGNORESDPVERSION | \
1531 SIP_PAGE2_VIDEOSUPPORT | SIP_PAGE2_T38SUPPORT | SIP_PAGE2_RFC2833_COMPENSATE | \
1532 SIP_PAGE2_BUGGY_MWI | SIP_PAGE2_TEXTSUPPORT | SIP_PAGE2_FAX_DETECT | \
1533 SIP_PAGE2_UDPTL_DESTINATION | SIP_PAGE2_VIDEOSUPPORT_ALWAYS | SIP_PAGE2_PREFERRED_CODEC | \
1534 SIP_PAGE2_RPID_IMMEDIATE | SIP_PAGE2_RPID_UPDATE | SIP_PAGE2_SYMMETRICRTP)
1538 /*! \brief debugging state
1539 * We store separately the debugging requests from the config file
1540 * and requests from the CLI. Debugging is enabled if either is set
1541 * (which means that if sipdebug is set in the config file, we can
1542 * only turn it off by reloading the config).
1546 sip_debug_config = 1,
1547 sip_debug_console = 2,
1550 static enum sip_debug_e sipdebug;
1552 /*! \brief extra debugging for 'text' related events.
1553 * At the moment this is set together with sip_debug_console.
1554 * \note It should either go away or be implemented properly.
1556 static int sipdebug_text;
1558 /*! \brief T38 States for a call */
1560 T38_DISABLED = 0, /*!< Not enabled */
1561 T38_LOCAL_REINVITE, /*!< Offered from local - REINVITE */
1562 T38_PEER_REINVITE, /*!< Offered from peer - REINVITE */
1563 T38_ENABLED /*!< Negotiated (enabled) */
1566 /*! \brief T.38 channel settings (at some point we need to make this alloc'ed */
1567 struct t38properties {
1568 enum t38state state; /*!< T.38 state */
1569 struct ast_control_t38_parameters our_parms;
1570 struct ast_control_t38_parameters their_parms;
1573 /*! \brief Parameters to know status of transfer */
1575 REFER_IDLE, /*!< No REFER is in progress */
1576 REFER_SENT, /*!< Sent REFER to transferee */
1577 REFER_RECEIVED, /*!< Received REFER from transferrer */
1578 REFER_CONFIRMED, /*!< Refer confirmed with a 100 TRYING (unused) */
1579 REFER_ACCEPTED, /*!< Accepted by transferee */
1580 REFER_RINGING, /*!< Target Ringing */
1581 REFER_200OK, /*!< Answered by transfer target */
1582 REFER_FAILED, /*!< REFER declined - go on */
1583 REFER_NOAUTH /*!< We had no auth for REFER */
1586 /*! \brief generic struct to map between strings and integers.
1587 * Fill it with x-s pairs, terminate with an entry with s = NULL;
1588 * Then you can call map_x_s(...) to map an integer to a string,
1589 * and map_s_x() for the string -> integer mapping.
1596 static const struct _map_x_s referstatusstrings[] = {
1597 { REFER_IDLE, "<none>" },
1598 { REFER_SENT, "Request sent" },
1599 { REFER_RECEIVED, "Request received" },
1600 { REFER_CONFIRMED, "Confirmed" },
1601 { REFER_ACCEPTED, "Accepted" },
1602 { REFER_RINGING, "Target ringing" },
1603 { REFER_200OK, "Done" },
1604 { REFER_FAILED, "Failed" },
1605 { REFER_NOAUTH, "Failed - auth failure" },
1606 { -1, NULL} /* terminator */
1609 /*! \brief Structure to handle SIP transfers. Dynamically allocated when needed
1610 \note OEJ: Should be moved to string fields */
1612 char refer_to[AST_MAX_EXTENSION]; /*!< Place to store REFER-TO extension */
1613 char refer_to_domain[AST_MAX_EXTENSION]; /*!< Place to store REFER-TO domain */
1614 char refer_to_urioption[AST_MAX_EXTENSION]; /*!< Place to store REFER-TO uri options */
1615 char refer_to_context[AST_MAX_EXTENSION]; /*!< Place to store REFER-TO context */
1616 char referred_by[AST_MAX_EXTENSION]; /*!< Place to store REFERRED-BY extension */
1617 char referred_by_name[AST_MAX_EXTENSION]; /*!< Place to store REFERRED-BY extension */
1618 char refer_contact[AST_MAX_EXTENSION]; /*!< Place to store Contact info from a REFER extension */
1619 char replaces_callid[SIPBUFSIZE]; /*!< Replace info: callid */
1620 char replaces_callid_totag[SIPBUFSIZE/2]; /*!< Replace info: to-tag */
1621 char replaces_callid_fromtag[SIPBUFSIZE/2]; /*!< Replace info: from-tag */
1622 struct sip_pvt *refer_call; /*!< Call we are referring. This is just a reference to a
1623 * dialog owned by someone else, so we should not destroy
1624 * it when the sip_refer object goes.
1626 int attendedtransfer; /*!< Attended or blind transfer? */
1627 int localtransfer; /*!< Transfer to local domain? */
1628 enum referstatus status; /*!< REFER status */
1632 /*! \brief Structure that encapsulates all attributes related to running
1633 * SIP Session-Timers feature on a per dialog basis.
1636 int st_active; /*!< Session-Timers on/off */
1637 int st_interval; /*!< Session-Timers negotiated session refresh interval */
1638 int st_schedid; /*!< Session-Timers ast_sched scheduler id */
1639 enum st_refresher st_ref; /*!< Session-Timers session refresher */
1640 int st_expirys; /*!< Session-Timers number of expirys */
1641 int st_active_peer_ua; /*!< Session-Timers on/off in peer UA */
1642 int st_cached_min_se; /*!< Session-Timers cached Min-SE */
1643 int st_cached_max_se; /*!< Session-Timers cached Session-Expires */
1644 enum st_mode st_cached_mode; /*!< Session-Timers cached M.O. */
1645 enum st_refresher st_cached_ref; /*!< Session-Timers cached refresher */
1649 /*! \brief Structure that encapsulates all attributes related to configuration
1650 * of SIP Session-Timers feature on a per user/peer basis.
1653 enum st_mode st_mode_oper; /*!< Mode of operation for Session-Timers */
1654 enum st_refresher st_ref; /*!< Session-Timer refresher */
1655 int st_min_se; /*!< Lowest threshold for session refresh interval */
1656 int st_max_se; /*!< Highest threshold for session refresh interval */
1659 struct offered_media {
1664 /*! \brief Structure used for each SIP dialog, ie. a call, a registration, a subscribe.
1665 * Created and initialized by sip_alloc(), the descriptor goes into the list of
1666 * descriptors (dialoglist).
1669 struct sip_pvt *next; /*!< Next dialog in chain */
1670 enum invitestates invitestate; /*!< Track state of SIP_INVITEs */
1671 int method; /*!< SIP method that opened this dialog */
1672 AST_DECLARE_STRING_FIELDS(
1673 AST_STRING_FIELD(callid); /*!< Global CallID */
1674 AST_STRING_FIELD(randdata); /*!< Random data */
1675 AST_STRING_FIELD(accountcode); /*!< Account code */
1676 AST_STRING_FIELD(realm); /*!< Authorization realm */
1677 AST_STRING_FIELD(nonce); /*!< Authorization nonce */
1678 AST_STRING_FIELD(opaque); /*!< Opaque nonsense */
1679 AST_STRING_FIELD(qop); /*!< Quality of Protection, since SIP wasn't complicated enough yet. */
1680 AST_STRING_FIELD(domain); /*!< Authorization domain */
1681 AST_STRING_FIELD(from); /*!< The From: header */
1682 AST_STRING_FIELD(useragent); /*!< User agent in SIP request */
1683 AST_STRING_FIELD(exten); /*!< Extension where to start */
1684 AST_STRING_FIELD(context); /*!< Context for this call */
1685 AST_STRING_FIELD(subscribecontext); /*!< Subscribecontext */
1686 AST_STRING_FIELD(subscribeuri); /*!< Subscribecontext */
1687 AST_STRING_FIELD(fromdomain); /*!< Domain to show in the from field */
1688 AST_STRING_FIELD(fromuser); /*!< User to show in the user field */
1689 AST_STRING_FIELD(fromname); /*!< Name to show in the user field */
1690 AST_STRING_FIELD(tohost); /*!< Host we should put in the "to" field */
1691 AST_STRING_FIELD(todnid); /*!< DNID of this call (overrides host) */
1692 AST_STRING_FIELD(language); /*!< Default language for this call */
1693 AST_STRING_FIELD(mohinterpret); /*!< MOH class to use when put on hold */
1694 AST_STRING_FIELD(mohsuggest); /*!< MOH class to suggest when putting a peer on hold */
1695 AST_STRING_FIELD(rdnis); /*!< Referring DNIS */
1696 AST_STRING_FIELD(redircause); /*!< Referring cause */
1697 AST_STRING_FIELD(theirtag); /*!< Their tag */
1698 AST_STRING_FIELD(username); /*!< [user] name */
1699 AST_STRING_FIELD(peername); /*!< [peer] name, not set if [user] */
1700 AST_STRING_FIELD(authname); /*!< Who we use for authentication */
1701 AST_STRING_FIELD(uri); /*!< Original requested URI */
1702 AST_STRING_FIELD(okcontacturi); /*!< URI from the 200 OK on INVITE */
1703 AST_STRING_FIELD(peersecret); /*!< Password */
1704 AST_STRING_FIELD(peermd5secret);
1705 AST_STRING_FIELD(cid_num); /*!< Caller*ID number */
1706 AST_STRING_FIELD(cid_name); /*!< Caller*ID name */
1707 AST_STRING_FIELD(mwi_from); /*!< Name to place in the From header in outgoing NOTIFY requests */
1708 AST_STRING_FIELD(fullcontact); /*!< The Contact: that the UA registers with us */
1709 /* we only store the part in <brackets> in this field. */
1710 AST_STRING_FIELD(our_contact); /*!< Our contact header */
1711 AST_STRING_FIELD(url); /*!< URL to be sent with next message to peer */
1712 AST_STRING_FIELD(parkinglot); /*!< Parkinglot */
1713 AST_STRING_FIELD(engine); /*!< RTP engine to use */
1715 char via[128]; /*!< Via: header */
1716 struct sip_socket socket; /*!< The socket used for this dialog */
1717 unsigned int ocseq; /*!< Current outgoing seqno */
1718 unsigned int icseq; /*!< Current incoming seqno */
1719 ast_group_t callgroup; /*!< Call group */
1720 ast_group_t pickupgroup; /*!< Pickup group */
1721 int lastinvite; /*!< Last Cseq of invite */
1722 struct ast_flags flags[2]; /*!< SIP_ flags */
1724 /* boolean flags that don't belong in flags */
1725 unsigned short do_history:1; /*!< Set if we want to record history */
1726 unsigned short alreadygone:1; /*!< already destroyed by our peer */
1727 unsigned short needdestroy:1; /*!< need to be destroyed by the monitor thread */
1728 unsigned short outgoing_call:1; /*!< this is an outgoing call */
1729 unsigned short answered_elsewhere:1; /*!< This call is cancelled due to answer on another channel */
1730 unsigned short novideo:1; /*!< Didn't get video in invite, don't offer */
1731 unsigned short notext:1; /*!< Text not supported (?) */
1732 unsigned short session_modify:1; /*!< Session modification request true/false */
1733 unsigned short route_persistent:1; /*!< Is this the "real" route? */
1734 unsigned short autoframing:1; /*!< Whether to use our local configuration for frame sizes (off)
1735 * or respect the other endpoint's request for frame sizes (on)
1736 * for incoming calls
1738 char tag[11]; /*!< Our tag for this session */
1739 int timer_t1; /*!< SIP timer T1, ms rtt */
1740 int timer_b; /*!< SIP timer B, ms */
1741 unsigned int sipoptions; /*!< Supported SIP options on the other end */
1742 unsigned int reqsipoptions; /*!< Required SIP options on the other end */
1743 struct ast_codec_pref prefs; /*!< codec prefs */
1744 int capability; /*!< Special capability (codec) */
1745 int jointcapability; /*!< Supported capability at both ends (codecs) */
1746 int peercapability; /*!< Supported peer capability */
1747 int prefcodec; /*!< Preferred codec (outbound only) */
1748 int noncodeccapability; /*!< DTMF RFC2833 telephony-event */
1749 int jointnoncodeccapability; /*!< Joint Non codec capability */
1750 int redircodecs; /*!< Redirect codecs */
1751 int maxcallbitrate; /*!< Maximum Call Bitrate for Video Calls */
1752 int request_queue_sched_id; /*!< Scheduler ID of any scheduled action to process queued requests */
1753 int authtries; /*!< Times we've tried to authenticate */
1754 struct sip_proxy *outboundproxy; /*!< Outbound proxy for this dialog. Use ref_proxy to set this instead of setting it directly*/
1755 struct t38properties t38; /*!< T38 settings */
1756 struct sockaddr_in udptlredirip; /*!< Where our T.38 UDPTL should be going if not to us */
1757 struct ast_udptl *udptl; /*!< T.38 UDPTL session */
1758 int callingpres; /*!< Calling presentation */
1759 int expiry; /*!< How long we take to expire */
1760 int sessionversion; /*!< SDP Session Version */
1761 int sessionid; /*!< SDP Session ID */
1762 long branch; /*!< The branch identifier of this session */
1763 long invite_branch; /*!< The branch used when we sent the initial INVITE */
1764 int64_t sessionversion_remote; /*!< Remote UA's SDP Session Version */
1765 struct sockaddr_in sa; /*!< Our peer */
1766 struct sockaddr_in redirip; /*!< Where our RTP should be going if not to us */
1767 struct sockaddr_in vredirip; /*!< Where our Video RTP should be going if not to us */
1768 struct sockaddr_in tredirip; /*!< Where our Text RTP should be going if not to us */
1769 time_t lastrtprx; /*!< Last RTP received */
1770 time_t lastrtptx; /*!< Last RTP sent */
1771 int rtptimeout; /*!< RTP timeout time */
1772 struct sockaddr_in recv; /*!< Received as */
1773 struct sockaddr_in ourip; /*!< Our IP (as seen from the outside) */
1774 enum transfermodes allowtransfer; /*!< REFER: restriction scheme */
1775 struct ast_channel *owner; /*!< Who owns us (if we have an owner) */
1776 struct sip_route *route; /*!< Head of linked list of routing steps (fm Record-Route) */
1777 struct ast_variable *notify_headers; /*!< Custom notify type */
1778 struct sip_auth *peerauth; /*!< Realm authentication */
1779 int noncecount; /*!< Nonce-count */
1780 unsigned int stalenonce:1; /*!< Marks the current nonce as responded too */
1781 char lastmsg[256]; /*!< Last Message sent/received */
1782 int amaflags; /*!< AMA Flags */
1783 int pendinginvite; /*!< Any pending INVITE or state NOTIFY (in subscribe pvt's) ? (seqno of this) */
1784 int glareinvite; /*!< A invite received while a pending invite is already present is stored here. Its seqno is the
1785 value. Since this glare invite's seqno is not the same as the pending invite's, it must be
1786 held in order to properly process acknowledgements for our 491 response. */
1787 struct sip_request initreq; /*!< Latest request that opened a new transaction
1789 NOT the request that opened the dialog */
1791 int initid; /*!< Auto-congest ID if appropriate (scheduler) */
1792 int waitid; /*!< Wait ID for scheduler after 491 or other delays */
1793 int autokillid; /*!< Auto-kill ID (scheduler) */
1794 int t38id; /*!< T.38 Response ID */
1795 struct sip_refer *refer; /*!< REFER: SIP transfer data structure */
1796 enum subscriptiontype subscribed; /*!< SUBSCRIBE: Is this dialog a subscription? */
1797 int stateid; /*!< SUBSCRIBE: ID for devicestate subscriptions */
1798 int laststate; /*!< SUBSCRIBE: Last known extension state */
1799 int dialogver; /*!< SUBSCRIBE: Version for subscription dialog-info */
1801 struct ast_dsp *dsp; /*!< Inband DTMF Detection dsp */
1803 struct sip_peer *relatedpeer; /*!< If this dialog is related to a peer, which one
1804 Used in peerpoke, mwi subscriptions */
1805 struct sip_registry *registry; /*!< If this is a REGISTER dialog, to which registry */
1806 struct ast_rtp_instance *rtp; /*!< RTP Session */
1807 struct ast_rtp_instance *vrtp; /*!< Video RTP session */
1808 struct ast_rtp_instance *trtp; /*!< Text RTP session */
1809 struct sip_pkt *packets; /*!< Packets scheduled for re-transmission */
1810 struct sip_history_head *history; /*!< History of this SIP dialog */
1811 size_t history_entries; /*!< Number of entires in the history */
1812 struct ast_variable *chanvars; /*!< Channel variables to set for inbound call */
1813 AST_LIST_HEAD_NOLOCK(request_queue, sip_request) request_queue; /*!< Requests that arrived but could not be processed immediately */
1814 struct sip_invite_param *options; /*!< Options for INVITE */
1815 struct sip_st_dlg *stimer; /*!< SIP Session-Timers */
1817 int red; /*!< T.140 RTP Redundancy */
1818 int hangupcause; /*!< Storage of hangupcause copied from our owner before we disconnect from the AST channel (only used at hangup) */
1820 struct sip_subscription_mwi *mwi; /*!< If this is a subscription MWI dialog, to which subscription */
1821 /*! The SIP methods supported by this peer. We get this information from the Allow header of the first
1822 * message we receive from an endpoint during a dialog.
1824 unsigned int allowed_methods;
1825 /*! Some peers are not trustworthy with their Allow headers, and so we need to override their wicked
1826 * ways through configuration. This is a copy of the peer's disallowed_methods, so that we can apply them
1827 * to the sip_pvt at various stages of dialog establishment
1829 unsigned int disallowed_methods;
1830 /*! When receiving an SDP offer, it is important to take note of what media types were offered.
1831 * By doing this, even if we don't want to answer a particular media stream with something meaningful, we can
1832 * still put an m= line in our answer with the port set to 0.
1834 * The reason for the length being 4 is that in this branch of Asterisk, the only media types supported are
1835 * image, audio, text, and video. Therefore we need to keep track of which types of media were offered.
1837 * Note that if we wanted to be 100% correct, we would keep a list of all media streams offered. That way we could respond
1838 * even to unknown media types, and we could respond to multiple streams of the same type. Such large-scale changes
1839 * are not a good idea for released branches, though, so we're compromising by just making sure that for the common cases:
1840 * audio and video, audio and T.38, and audio and text, we give the appropriate response to both media streams.
1842 * The large-scale changes would be a good idea for implementing during an SDP rewrite.
1844 struct offered_media offered_media[4];
1849 * Here we implement the container for dialogs (sip_pvt), defining
1850 * generic wrapper functions to ease the transition from the current
1851 * implementation (a single linked list) to a different container.
1852 * In addition to a reference to the container, we need functions to lock/unlock
1853 * the container and individual items, and functions to add/remove
1854 * references to the individual items.
1856 static struct ao2_container *dialogs;
1858 #define sip_pvt_lock(x) ao2_lock(x)
1859 #define sip_pvt_trylock(x) ao2_trylock(x)
1860 #define sip_pvt_unlock(x) ao2_unlock(x)
1863 * when we create or delete references, make sure to use these
1864 * functions so we keep track of the refcounts.
1865 * To simplify the code, we allow a NULL to be passed to dialog_unref().
1868 #define dialog_ref(arg1,arg2) dialog_ref_debug((arg1),(arg2), __FILE__, __LINE__, __PRETTY_FUNCTION__)
1869 #define dialog_unref(arg1,arg2) dialog_unref_debug((arg1),(arg2), __FILE__, __LINE__, __PRETTY_FUNCTION__)
1871 static struct sip_pvt *dialog_ref_debug(struct sip_pvt *p, char *tag, char *file, int line, const char *func)
1874 _ao2_ref_debug(p, 1, tag, file, line, func);
1876 ast_log(LOG_ERROR, "Attempt to Ref a null pointer\n");
1880 static struct sip_pvt *dialog_unref_debug(struct sip_pvt *p, char *tag, char *file, int line, const char *func)
1883 _ao2_ref_debug(p, -1, tag, file, line, func);
1887 static struct sip_pvt *dialog_ref(struct sip_pvt *p, char *tag)
1892 ast_log(LOG_ERROR, "Attempt to Ref a null pointer\n");
1896 static struct sip_pvt *dialog_unref(struct sip_pvt *p, char *tag)
1904 /*! \brief sip packet - raw format for outbound packets that are sent or scheduled for transmission
1905 * Packets are linked in a list, whose head is in the struct sip_pvt they belong to.
1906 * Each packet holds a reference to the parent struct sip_pvt.
1907 * This structure is allocated in __sip_reliable_xmit() and only for packets that
1908 * require retransmissions.
1911 struct sip_pkt *next; /*!< Next packet in linked list */
1912 int retrans; /*!< Retransmission number */
1913 int method; /*!< SIP method for this packet */
1914 int seqno; /*!< Sequence number */
1915 char is_resp; /*!< 1 if this is a response packet (e.g. 200 OK), 0 if it is a request */
1916 char is_fatal; /*!< non-zero if there is a fatal error */
1917 int response_code; /*!< If this is a response, the response code */
1918 struct sip_pvt *owner; /*!< Owner AST call */
1919 int retransid; /*!< Retransmission ID */
1920 int timer_a; /*!< SIP timer A, retransmission timer */
1921 int timer_t1; /*!< SIP Timer T1, estimated RTT or 500 ms */
1922 int packetlen; /*!< Length of packet */
1923 struct ast_str *data;
1927 * \brief A peer's mailbox
1929 * We could use STRINGFIELDS here, but for only two strings, it seems like
1930 * too much effort ...
1932 struct sip_mailbox {
1935 /*! Associated MWI subscription */
1936 struct ast_event_sub *event_sub;
1937 AST_LIST_ENTRY(sip_mailbox) entry;
1940 enum sip_peer_type {
1941 SIP_TYPE_PEER = (1 << 0),
1942 SIP_TYPE_USER = (1 << 1),
1945 /*! \brief Structure for SIP peer data, we place calls to peers if registered or fixed IP address (host)
1947 /* XXX field 'name' must be first otherwise sip_addrcmp() will fail, as will astobj2 hashing of the structure */
1949 char name[80]; /*!< the unique name of this object */
1950 AST_DECLARE_STRING_FIELDS(
1951 AST_STRING_FIELD(secret); /*!< Password for inbound auth */
1952 AST_STRING_FIELD(md5secret); /*!< Password in MD5 */
1953 AST_STRING_FIELD(remotesecret); /*!< Remote secret (trunks, remote devices) */
1954 AST_STRING_FIELD(context); /*!< Default context for incoming calls */
1955 AST_STRING_FIELD(subscribecontext); /*!< Default context for subscriptions */
1956 AST_STRING_FIELD(username); /*!< Temporary username until registration */
1957 AST_STRING_FIELD(accountcode); /*!< Account code */
1958 AST_STRING_FIELD(tohost); /*!< If not dynamic, IP address */
1959 AST_STRING_FIELD(regexten); /*!< Extension to register (if regcontext is used) */
1960 AST_STRING_FIELD(fromuser); /*!< From: user when calling this peer */
1961 AST_STRING_FIELD(fromdomain); /*!< From: domain when calling this peer */
1962 AST_STRING_FIELD(fullcontact); /*!< Contact registered with us (not in sip.conf) */
1963 AST_STRING_FIELD(cid_num); /*!< Caller ID num */
1964 AST_STRING_FIELD(cid_name); /*!< Caller ID name */
1965 AST_STRING_FIELD(vmexten); /*!< Dialplan extension for MWI notify message*/
1966 AST_STRING_FIELD(language); /*!< Default language for prompts */
1967 AST_STRING_FIELD(mohinterpret); /*!< Music on Hold class */
1968 AST_STRING_FIELD(mohsuggest); /*!< Music on Hold class */
1969 AST_STRING_FIELD(parkinglot); /*!< Parkinglot */
1970 AST_STRING_FIELD(useragent); /*!< User agent in SIP request (saved from registration) */
1971 AST_STRING_FIELD(mwi_from); /*!< Name to place in From header for outgoing NOTIFY requests */
1972 AST_STRING_FIELD(engine); /*!< RTP Engine to use */
1974 struct sip_socket socket; /*!< Socket used for this peer */
1975 enum sip_transport default_outbound_transport; /*!< Peer Registration may change the default outbound transport.
1976 If register expires, default should be reset. to this value */
1977 /* things that don't belong in flags */
1978 unsigned short transports:3; /*!< Transports (enum sip_transport) that are acceptable for this peer */
1979 unsigned short is_realtime:1; /*!< this is a 'realtime' peer */
1980 unsigned short rt_fromcontact:1;/*!< copy fromcontact from realtime */
1981 unsigned short host_dynamic:1; /*!< Dynamic Peers register with Asterisk */
1982 unsigned short selfdestruct:1; /*!< Automatic peers need to destruct themselves */
1983 unsigned short the_mark:1; /*!< moved out of ASTOBJ into struct proper; That which bears the_mark should be deleted! */
1984 unsigned short autoframing:1; /*!< Whether to use our local configuration for frame sizes (off)
1985 * or respect the other endpoint's request for frame sizes (on)
1986 * for incoming calls
1988 struct sip_auth *auth; /*!< Realm authentication list */
1989 int amaflags; /*!< AMA Flags (for billing) */
1990 int callingpres; /*!< Calling id presentation */
1991 int inUse; /*!< Number of calls in use */
1992 int inRinging; /*!< Number of calls ringing */
1993 int onHold; /*!< Peer has someone on hold */
1994 int call_limit; /*!< Limit of concurrent calls */
1995 int busy_level; /*!< Level of active channels where we signal busy */
1996 enum transfermodes allowtransfer; /*! SIP Refer restriction scheme */
1997 struct ast_codec_pref prefs; /*!< codec prefs */
1999 unsigned int sipoptions; /*!< Supported SIP options */
2000 struct ast_flags flags[2]; /*!< SIP_ flags */
2002 /*! Mailboxes that this peer cares about */
2003 AST_LIST_HEAD_NOLOCK(, sip_mailbox) mailboxes;
2005 int maxcallbitrate; /*!< Maximum Bitrate for a video call */
2006 int expire; /*!< When to expire this peer registration */
2007 int capability; /*!< Codec capability */
2008 int rtptimeout; /*!< RTP timeout */
2009 int rtpholdtimeout; /*!< RTP Hold Timeout */
2010 int rtpkeepalive; /*!< Send RTP packets for keepalive */
2011 ast_group_t callgroup; /*!< Call group */
2012 ast_group_t pickupgroup; /*!< Pickup group */
2013 struct sip_proxy *outboundproxy; /*!< Outbound proxy for this peer */
2014 struct ast_dnsmgr_entry *dnsmgr;/*!< DNS refresh manager for peer */
2015 struct sockaddr_in addr; /*!< IP address of peer */
2017 struct sip_pvt *call; /*!< Call pointer */
2018 int pokeexpire; /*!< When to expire poke (qualify= checking) */
2019 int lastms; /*!< How long last response took (in ms), or -1 for no response */
2020 int maxms; /*!< Max ms we will accept for the host to be up, 0 to not monitor */
2021 int qualifyfreq; /*!< Qualification: How often to check for the host to be up */
2022 struct timeval ps; /*!< Time for sending SIP OPTION in sip_pke_peer() */
2023 struct sockaddr_in defaddr; /*!< Default IP address, used until registration */
2024 struct ast_ha *ha; /*!< Access control list */
2025 struct ast_ha *contactha; /*!< Restrict what IPs are allowed in the Contact header (for registration) */
2026 struct ast_variable *chanvars; /*!< Variables to set for channel created by user */
2027 struct sip_pvt *mwipvt; /*!< Subscription for MWI */
2028 struct sip_st_cfg stimer; /*!< SIP Session-Timers */
2029 int timer_t1; /*!< The maximum T1 value for the peer */
2030 int timer_b; /*!< The maximum timer B (transaction timeouts) */
2031 int deprecated_username; /*!< If it's a realtime peer, are they using the deprecated "username" instead of "defaultuser" */
2033 /*XXX Seems like we suddenly have two flags with the same content. Why? To be continued... */
2034 enum sip_peer_type type; /*!< Distinguish between "user" and "peer" types. This is used solely for CLI and manager commands */
2035 unsigned int disallowed_methods;
2040 * \brief Registrations with other SIP proxies
2042 * Created by sip_register(), the entry is linked in the 'regl' list,
2043 * and never deleted (other than at 'sip reload' or module unload times).
2044 * The entry always has a pending timeout, either waiting for an ACK to
2045 * the REGISTER message (in which case we have to retransmit the request),
2046 * or waiting for the next REGISTER message to be sent (either the initial one,
2047 * or once the previously completed registration one expires).
2048 * The registration can be in one of many states, though at the moment
2049 * the handling is a bit mixed.
2051 struct sip_registry {
2052 ASTOBJ_COMPONENTS_FULL(struct sip_registry,1,1);
2053 AST_DECLARE_STRING_FIELDS(
2054 AST_STRING_FIELD(callid); /*!< Global Call-ID */
2055 AST_STRING_FIELD(realm); /*!< Authorization realm */
2056 AST_STRING_FIELD(nonce); /*!< Authorization nonce */
2057 AST_STRING_FIELD(opaque); /*!< Opaque nonsense */
2058 AST_STRING_FIELD(qop); /*!< Quality of Protection, since SIP wasn't complicated enough yet. */
2059 AST_STRING_FIELD(authdomain); /*!< Authorization domain */
2060 AST_STRING_FIELD(regdomain); /*!< Registration domain */
2061 AST_STRING_FIELD(username); /*!< Who we are registering as */
2062 AST_STRING_FIELD(authuser); /*!< Who we *authenticate* as */
2063 AST_STRING_FIELD(hostname); /*!< Domain or host we register to */
2064 AST_STRING_FIELD(secret); /*!< Password in clear text */
2065 AST_STRING_FIELD(md5secret); /*!< Password in md5 */
2066 AST_STRING_FIELD(callback); /*!< Contact extension */
2067 AST_STRING_FIELD(random);
2068 AST_STRING_FIELD(peername); /*!< Peer registering to */
2070 enum sip_transport transport; /*!< Transport for this registration UDP, TCP or TLS */
2071 int portno; /*!< Optional port override */
2072 int expire; /*!< Sched ID of expiration */
2073 int expiry; /*!< Value to use for the Expires header */
2074 int regattempts; /*!< Number of attempts (since the last success) */
2075 int timeout; /*!< sched id of sip_reg_timeout */
2076 int refresh; /*!< How often to refresh */
2077 struct sip_pvt *call; /*!< create a sip_pvt structure for each outbound "registration dialog" in progress */
2078 enum sipregistrystate regstate; /*!< Registration state (see above) */
2079 struct timeval regtime; /*!< Last successful registration time */
2080 int callid_valid; /*!< 0 means we haven't chosen callid for this registry yet. */
2081 unsigned int ocseq; /*!< Sequence number we got to for REGISTERs for this registry */
2082 struct ast_dnsmgr_entry *dnsmgr; /*!< DNS refresh manager for register */
2083 struct sockaddr_in us; /*!< Who the server thinks we are */
2084 int noncecount; /*!< Nonce-count */
2085 char lastmsg[256]; /*!< Last Message sent/received */
2088 /*! \brief Definition of a thread that handles a socket */
2089 struct sip_threadinfo {
2092 struct ast_tcptls_session_instance *tcptls_session;
2093 enum sip_transport type; /*!< We keep a copy of the type here so we can display it in the connection list */
2094 AST_LIST_ENTRY(sip_threadinfo) list;
2097 /*! \brief Definition of an MWI subscription to another server */
2098 struct sip_subscription_mwi {
2099 ASTOBJ_COMPONENTS_FULL(struct sip_subscription_mwi,1,1);
2100 AST_DECLARE_STRING_FIELDS(
2101 AST_STRING_FIELD(username); /*!< Who we are sending the subscription as */
2102 AST_STRING_FIELD(authuser); /*!< Who we *authenticate* as */
2103 AST_STRING_FIELD(hostname); /*!< Domain or host we subscribe to */
2104 AST_STRING_FIELD(secret); /*!< Password in clear text */
2105 AST_STRING_FIELD(mailbox); /*!< Mailbox store to put MWI into */
2107 enum sip_transport transport; /*!< Transport to use */
2108 int portno; /*!< Optional port override */
2109 int resub; /*!< Sched ID of resubscription */
2110 unsigned int subscribed:1; /*!< Whether we are currently subscribed or not */
2111 struct sip_pvt *call; /*!< Outbound subscription dialog */
2112 struct ast_dnsmgr_entry *dnsmgr; /*!< DNS refresh manager for subscription */
2113 struct sockaddr_in us; /*!< Who the server thinks we are */
2116 /* --- Hash tables of various objects --------*/
2119 static int hash_peer_size = 17;
2120 static int hash_dialog_size = 17;
2121 static int hash_user_size = 17;
2123 static int hash_peer_size = 563; /*!< Size of peer hash table, prime number preferred! */
2124 static int hash_dialog_size = 563;
2125 static int hash_user_size = 563;
2128 /*! \brief The thread list of TCP threads */
2129 static AST_LIST_HEAD_STATIC(threadl, sip_threadinfo);
2131 /*! \brief The peer list: Users, Peers and Friends */
2132 static struct ao2_container *peers;
2133 static struct ao2_container *peers_by_ip;
2135 /*! \brief The register list: Other SIP proxies we register with and place calls to */
2136 static struct ast_register_list {
2137 ASTOBJ_CONTAINER_COMPONENTS(struct sip_registry);
2141 /*! \brief The MWI subscription list */
2142 static struct ast_subscription_mwi_list {
2143 ASTOBJ_CONTAINER_COMPONENTS(struct sip_subscription_mwi);
2147 * \note The only member of the peer used here is the name field
2149 static int peer_hash_cb(const void *obj, const int flags)
2151 const struct sip_peer *peer = obj;
2153 return ast_str_case_hash(peer->name);
2157 * \note The only member of the peer used here is the name field
2159 static int peer_cmp_cb(void *obj, void *arg, int flags)
2161 struct sip_peer *peer = obj, *peer2 = arg;
2163 return !strcasecmp(peer->name, peer2->name) ? CMP_MATCH | CMP_STOP : 0;
2167 * \note the peer's addr struct provides to fields combined to make a key: the sin_addr.s_addr and sin_port fields.
2169 static int peer_iphash_cb(const void *obj, const int flags)
2171 const struct sip_peer *peer = obj;
2172 int ret1 = peer->addr.sin_addr.s_addr;
2176 if (ast_test_flag(&peer->flags[0], SIP_INSECURE_PORT)) {
2179 return ret1 + peer->addr.sin_port;
2184 * \note the peer's addr struct provides to fields combined to make a key: the sin_addr.s_addr and sin_port fields.
2186 static int peer_ipcmp_cb(void *obj, void *arg, int flags)
2188 struct sip_peer *peer = obj, *peer2 = arg;
2190 if (peer->addr.sin_addr.s_addr != peer2->addr.sin_addr.s_addr)
2193 if (!ast_test_flag(&peer->flags[0], SIP_INSECURE_PORT) && !ast_test_flag(&peer2->flags[0], SIP_INSECURE_PORT)) {
2194 if (peer->addr.sin_port == peer2->addr.sin_port)
2195 return CMP_MATCH | CMP_STOP;
2199 return CMP_MATCH | CMP_STOP;
2203 * \note The only member of the dialog used here callid string
2205 static int dialog_hash_cb(const void *obj, const int flags)
2207 const struct sip_pvt *pvt = obj;
2209 return ast_str_case_hash(pvt->callid);
2213 * \note The only member of the dialog used here callid string
2215 static int dialog_cmp_cb(void *obj, void *arg, int flags)
2217 struct sip_pvt *pvt = obj, *pvt2 = arg;
2219 return !strcasecmp(pvt->callid, pvt2->callid) ? CMP_MATCH | CMP_STOP : 0;
2222 static int temp_pvt_init(void *);
2223 static void temp_pvt_cleanup(void *);
2225 /*! \brief A per-thread temporary pvt structure */
2226 AST_THREADSTORAGE_CUSTOM(ts_temp_pvt, temp_pvt_init, temp_pvt_cleanup);
2229 static void ts_ast_rtp_destroy(void *);
2231 AST_THREADSTORAGE_CUSTOM(ts_audio_rtp, NULL, ts_ast_rtp_destroy);
2232 AST_THREADSTORAGE_CUSTOM(ts_video_rtp, NULL, ts_ast_rtp_destroy);
2233 AST_THREADSTORAGE_CUSTOM(ts_text_rtp, NULL, ts_ast_rtp_destroy);
2236 /*! \brief Authentication list for realm authentication
2237 * \todo Move the sip_auth list to AST_LIST */
2238 static struct sip_auth *authl = NULL;
2241 /* --- Sockets and networking --------------*/
2243 /*! \brief Main socket for UDP SIP communication.
2245 * sipsock is shared between the SIP manager thread (which handles reload
2246 * requests), the udp io handler (sipsock_read()) and the user routines that
2247 * issue udp writes (using __sip_xmit()).
2248 * The socket is -1 only when opening fails (this is a permanent condition),
2249 * or when we are handling a reload() that changes its address (this is
2250 * a transient situation during which we might have a harmless race, see
2251 * below). Because the conditions for the race to be possible are extremely
2252 * rare, we don't want to pay the cost of locking on every I/O.
2253 * Rather, we remember that when the race may occur, communication is
2254 * bound to fail anyways, so we just live with this event and let
2255 * the protocol handle this above us.
2257 static int sipsock = -1;
2259 static struct sockaddr_in bindaddr; /*!< UDP: The address we bind to */
2261 /*! \brief our (internal) default address/port to put in SIP/SDP messages
2262 * internip is initialized picking a suitable address from one of the
2263 * interfaces, and the same port number we bind to. It is used as the
2264 * default address/port in SIP messages, and as the default address
2265 * (but not port) in SDP messages.
2267 static struct sockaddr_in internip;
2269 /*! \brief our external IP address/port for SIP sessions.
2270 * externip.sin_addr is only set when we know we might be behind
2271 * a NAT, and this is done using a variety of (mutually exclusive)
2272 * ways from the config file:
2274 * + with "externip = host[:port]" we specify the address/port explicitly.
2275 * The address is looked up only once when (re)loading the config file;
2277 * + with "externhost = host[:port]" we do a similar thing, but the
2278 * hostname is stored in externhost, and the hostname->IP mapping
2279 * is refreshed every 'externrefresh' seconds;
2281 * + with "stunaddr = host[:port]" we run queries every externrefresh seconds
2282 * to the specified server, and store the result in externip.
2284 * Other variables (externhost, externexpire, externrefresh) are used
2285 * to support the above functions.
2287 static struct sockaddr_in externip; /*!< External IP address if we are behind NAT */
2289 static char externhost[MAXHOSTNAMELEN]; /*!< External host name */
2290 static time_t externexpire; /*!< Expiration counter for re-resolving external host name in dynamic DNS */
2291 static int externrefresh = 10;
2292 static struct sockaddr_in stunaddr; /*!< stun server address */
2294 /*! \brief List of local networks
2295 * We store "localnet" addresses from the config file into an access list,
2296 * marked as 'DENY', so the call to ast_apply_ha() will return
2297 * AST_SENSE_DENY for 'local' addresses, and AST_SENSE_ALLOW for 'non local'
2298 * (i.e. presumably public) addresses.
2300 static struct ast_ha *localaddr; /*!< List of local networks, on the same side of NAT as this Asterisk */
2302 static int ourport_tcp; /*!< The port used for TCP connections */
2303 static int ourport_tls; /*!< The port used for TCP/TLS connections */
2304 static struct sockaddr_in debugaddr;
2306 static struct ast_config *notify_types; /*!< The list of manual NOTIFY types we know how to send */
2308 /*! some list management macros. */
2310 #define UNLINK(element, head, prev) do { \
2312 (prev)->next = (element)->next; \
2314 (head) = (element)->next; \
2317 enum t38_action_flag {
2318 SDP_T38_NONE = 0, /*!< Do not modify T38 information at all */
2319 SDP_T38_INITIATE, /*!< Remote side has requested T38 with us */
2320 SDP_T38_ACCEPT, /*!< Remote side accepted our T38 request */
2323 /*---------------------------- Forward declarations of functions in chan_sip.c */
2324 /* Note: This is added to help splitting up chan_sip.c into several files
2325 in coming releases. */
2327 /*--- PBX interface functions */
2328 static struct ast_channel *sip_request_call(const char *type, int format, const struct ast_channel *requestor, void *data, int *cause);
2329 static int sip_devicestate(void *data);
2330 static int sip_sendtext(struct ast_channel *ast, const char *text);
2331 static int sip_call(struct ast_channel *ast, char *dest, int timeout);
2332 static int sip_sendhtml(struct ast_channel *chan, int subclass, const char *data, int datalen);
2333 static int sip_hangup(struct ast_channel *ast);
2334 static int sip_answer(struct ast_channel *ast);
2335 static struct ast_frame *sip_read(struct ast_channel *ast);
2336 static int sip_write(struct ast_channel *ast, struct ast_frame *frame);
2337 static int sip_indicate(struct ast_channel *ast, int condition, const void *data, size_t datalen);
2338 static int sip_transfer(struct ast_channel *ast, const char *dest);
2339 static int sip_fixup(struct ast_channel *oldchan, struct ast_channel *newchan);
2340 static int sip_senddigit_begin(struct ast_channel *ast, char digit);
2341 static int sip_senddigit_end(struct ast_channel *ast, char digit, unsigned int duration);
2342 static int sip_setoption(struct ast_channel *chan, int option, void *data, int datalen);
2343 static int sip_queryoption(struct ast_channel *chan, int option, void *data, int *datalen);
2344 static const char *sip_get_callid(struct ast_channel *chan);
2346 static int handle_request_do(struct sip_request *req, struct sockaddr_in *sin);
2347 static int sip_standard_port(enum sip_transport type, int port);
2348 static int sip_prepare_socket(struct sip_pvt *p);
2349 static int sip_parse_host(char *line, int lineno, char **hostname, int *portnum, enum sip_transport *transport);
2351 /*--- Transmitting responses and requests */
2352 static int sipsock_read(int *id, int fd, short events, void *ignore);
2353 static int __sip_xmit(struct sip_pvt *p, struct ast_str *data, int len);
2354 static int __sip_reliable_xmit(struct sip_pvt *p, int seqno, int resp, struct ast_str *data, int len, int fatal, int sipmethod);
2355 static int __transmit_response(struct sip_pvt *p, const char *msg, const struct sip_request *req, enum xmittype reliable);
2356 static int retrans_pkt(const void *data);
2357 static int transmit_response_using_temp(ast_string_field callid, struct sockaddr_in *sin, int useglobal_nat, const int intended_method, const struct sip_request *req, const char *msg);
2358 static int transmit_response(struct sip_pvt *p, const char *msg, const struct sip_request *req);
2359 static int transmit_response_reliable(struct sip_pvt *p, const char *msg, const struct sip_request *req);
2360 static int transmit_response_with_date(struct sip_pvt *p, const char *msg, const struct sip_request *req);
2361 static int transmit_response_with_sdp(struct sip_pvt *p, const char *msg, const struct sip_request *req, enum xmittype reliable, int oldsdp, int rpid);
2362 static int transmit_response_with_unsupported(struct sip_pvt *p, const char *msg, const struct sip_request *req, const char *unsupported);
2363 static int transmit_response_with_auth(struct sip_pvt *p, const char *msg, const struct sip_request *req, const char *rand, enum xmittype reliable, const char *header, int stale);
2364 static int transmit_response_with_allow(struct sip_pvt *p, const char *msg, const struct sip_request *req, enum xmittype reliable);
2365 static void transmit_fake_auth_response(struct sip_pvt *p, int sipmethod, struct sip_request *req, enum xmittype reliable);
2366 static int transmit_request(struct sip_pvt *p, int sipmethod, int inc, enum xmittype reliable, int newbranch);
2367 static int transmit_request_with_auth(struct sip_pvt *p, int sipmethod, int seqno, enum xmittype reliable, int newbranch);
2368 static int transmit_invite(struct sip_pvt *p, int sipmethod, int sdp, int init);
2369 static int transmit_reinvite_with_sdp(struct sip_pvt *p, int t38version, int oldsdp);
2370 static int transmit_info_with_digit(struct sip_pvt *p, const char digit, unsigned int duration);
2371 static int transmit_info_with_vidupdate(struct sip_pvt *p);
2372 static int transmit_message_with_text(struct sip_pvt *p, const char *text);
2373 static int transmit_refer(struct sip_pvt *p, const char *dest);
2374 static int transmit_notify_with_mwi(struct sip_pvt *p, int newmsgs, int oldmsgs, const char *vmexten);
2375 static int transmit_notify_with_sipfrag(struct sip_pvt *p, int cseq, char *message, int terminate);
2376 static int transmit_notify_custom(struct sip_pvt *p, struct ast_variable *vars);
2377 static int transmit_register(struct sip_registry *r, int sipmethod, const char *auth, const char *authheader);
2378 static int send_response(struct sip_pvt *p, struct sip_request *req, enum xmittype reliable, int seqno);
2379 static int send_request(struct sip_pvt *p, struct sip_request *req, enum xmittype reliable, int seqno);
2380 static void copy_request(struct sip_request *dst, const struct sip_request *src);
2381 static void receive_message(struct sip_pvt *p, struct sip_request *req);
2382 static void parse_moved_contact(struct sip_pvt *p, struct sip_request *req, char **name, char **number, int set_call_forward);
2383 static int sip_send_mwi_to_peer(struct sip_peer *peer, const struct ast_event *event, int cache_only);
2385 /*--- Dialog management */
2386 static struct sip_pvt *sip_alloc(ast_string_field callid, struct sockaddr_in *sin,
2387 int useglobal_nat, const int intended_method, struct sip_request *req);
2388 static int __sip_autodestruct(const void *data);
2389 static void sip_scheddestroy(struct sip_pvt *p, int ms);
2390 static int sip_cancel_destroy(struct sip_pvt *p);
2391 static struct sip_pvt *sip_destroy(struct sip_pvt *p);
2392 static void *dialog_unlink_all(struct sip_pvt *dialog, int lockowner, int lockdialoglist);
2393 static void *registry_unref(struct sip_registry *reg, char *tag);
2394 static void __sip_destroy(struct sip_pvt *p, int lockowner, int lockdialoglist);
2395 static int __sip_ack(struct sip_pvt *p, int seqno, int resp, int sipmethod);
2396 static void __sip_pretend_ack(struct sip_pvt *p);
2397 static int __sip_semi_ack(struct sip_pvt *p, int seqno, int resp, int sipmethod);
2398 static int auto_congest(const void *arg);
2399 static int update_call_counter(struct sip_pvt *fup, int event);
2400 static int hangup_sip2cause(int cause);
2401 static const char *hangup_cause2sip(int cause);
2402 static struct sip_pvt *find_call(struct sip_request *req, struct sockaddr_in *sin, const int intended_method);
2403 static void free_old_route(struct sip_route *route);
2404 static void list_route(struct sip_route *route);
2405 static void build_route(struct sip_pvt *p, struct sip_request *req, int backwards);
2406 static enum check_auth_result register_verify(struct sip_pvt *p, struct sockaddr_in *sin,
2407 struct sip_request *req, const char *uri);
2408 static struct sip_pvt *get_sip_pvt_byid_locked(const char *callid, const char *totag, const char *fromtag);
2409 static void check_pendings(struct sip_pvt *p);
2410 static void *sip_park_thread(void *stuff);
2411 static int sip_park(struct ast_channel *chan1, struct ast_channel *chan2, struct sip_request *req, int seqno);
2412 static int sip_sipredirect(struct sip_pvt *p, const char *dest);
2414 /*--- Codec handling / SDP */
2415 static void try_suggested_sip_codec(struct sip_pvt *p);
2416 static const char* get_sdp_iterate(int* start, struct sip_request *req, const char *name);
2417 static const char *get_sdp(struct sip_request *req, const char *name);
2418 static int find_sdp(struct sip_request *req);
2419 static int process_sdp(struct sip_pvt *p, struct sip_request *req, int t38action);
2420 static void add_codec_to_sdp(const struct sip_pvt *p, int codec,
2421 struct ast_str **m_buf, struct ast_str **a_buf,
2422 int debug, int *min_packet_size);
2423 static void add_noncodec_to_sdp(const struct sip_pvt *p, int format,
2424 struct ast_str **m_buf, struct ast_str **a_buf,
2426 static enum sip_result add_sdp(struct sip_request *resp, struct sip_pvt *p, int oldsdp, int add_audio, int add_t38);
2427 static void do_setnat(struct sip_pvt *p);
2428 static void stop_media_flows(struct sip_pvt *p);
2430 /*--- Authentication stuff */
2431 static int reply_digest(struct sip_pvt *p, struct sip_request *req, char *header, int sipmethod, char *digest, int digest_len);
2432 static int build_reply_digest(struct sip_pvt *p, int method, char *digest, int digest_len);
2433 static enum check_auth_result check_auth(struct sip_pvt *p, struct sip_request *req, const char *username,
2434 const char *secret, const char *md5secret, int sipmethod,
2435 const char *uri, enum xmittype reliable, int ignore);
2436 static enum check_auth_result check_user_full(struct sip_pvt *p, struct sip_request *req,
2437 int sipmethod, const char *uri, enum xmittype reliable,
2438 struct sockaddr_in *sin, struct sip_peer **authpeer);
2439 static int check_user(struct sip_pvt *p, struct sip_request *req, int sipmethod, const char *uri, enum xmittype reliable, struct sockaddr_in *sin);
2441 /*--- Domain handling */
2442 static int check_sip_domain(const char *domain, char *context, size_t len); /* Check if domain is one of our local domains */
2443 static int add_sip_domain(const char *domain, const enum domain_mode mode, const char *context);
2444 static void clear_sip_domains(void);
2446 /*--- SIP realm authentication */
2447 static struct sip_auth *add_realm_authentication(struct sip_auth *authlist, const char *configuration, int lineno);
2448 static int clear_realm_authentication(struct sip_auth *authlist); /* Clear realm authentication list (at reload) */
2449 static struct sip_auth *find_realm_authentication(struct sip_auth *authlist, const char *realm);
2451 /*--- Misc functions */
2452 static void check_rtp_timeout(struct sip_pvt *dialog, time_t t);
2453 static int sip_do_reload(enum channelreloadreason reason);
2454 static int reload_config(enum channelreloadreason reason);
2455 static int expire_register(const void *data);
2456 static void *do_monitor(void *data);
2457 static int restart_monitor(void);
2458 static void peer_mailboxes_to_str(struct ast_str **mailbox_str, struct sip_peer *peer);
2459 static struct ast_variable *copy_vars(struct ast_variable *src);
2460 /* static int sip_addrcmp(char *name, struct sockaddr_in *sin); Support for peer matching */
2461 static int sip_refer_allocate(struct sip_pvt *p);
2462 static void ast_quiet_chan(struct ast_channel *chan);
2463 static int attempt_transfer(struct sip_dual *transferer, struct sip_dual *target);
2464 static int do_magic_pickup(struct ast_channel *channel, const char *extension, const char *context);
2467 * \brief generic function for determining if a correct transport is being
2468 * used to contact a peer
2470 * this is done as a macro so that the "tmpl" var can be passed either a
2471 * sip_request or a sip_peer
2473 #define check_request_transport(peer, tmpl) ({ \
2475 if (peer->socket.type == tmpl->socket.type) \
2477 else if (!(peer->transports & tmpl->socket.type)) {\
2478 ast_log(LOG_ERROR, \
2479 "'%s' is not a valid transport for '%s'. we only use '%s'! ending call.\n", \
2480 get_transport(tmpl->socket.type), peer->name, get_transport_list(peer->transports) \
2483 } else if (peer->socket.type & SIP_TRANSPORT_TLS) { \
2484 ast_log(LOG_WARNING, \
2485 "peer '%s' HAS NOT USED (OR SWITCHED TO) TLS in favor of '%s' (but this was allowed in sip.conf)!\n", \
2486 peer->name, get_transport(tmpl->socket.type) \
2490 "peer '%s' has contacted us over %s even though we prefer %s.\n", \
2491 peer->name, get_transport(tmpl->socket.type), get_transport(peer->socket.type) \
2498 /*--- Device monitoring and Device/extension state/event handling */
2499 static int cb_extensionstate(char *context, char* exten, int state, void *data);
2500 static int sip_devicestate(void *data);
2501 static int sip_poke_noanswer(const void *data);
2502 static int sip_poke_peer(struct sip_peer *peer, int force);
2503 static void sip_poke_all_peers(void);
2504 static void sip_peer_hold(struct sip_pvt *p, int hold);
2505 static void mwi_event_cb(const struct ast_event *, void *);
2507 /*--- Applications, functions, CLI and manager command helpers */
2508 static const char *sip_nat_mode(const struct sip_pvt *p);
2509 static char *sip_show_inuse(struct ast_cli_entry *e, int cmd, struct ast_cli_args *a);
2510 static char *transfermode2str(enum transfermodes mode) attribute_const;
2511 static int peer_status(struct sip_peer *peer, char *status, int statuslen);
2512 static char *sip_show_sched(struct ast_cli_entry *e, int cmd, struct ast_cli_args *a);
2513 static char * _sip_show_peers(int fd, int *total, struct mansession *s, const struct message *m, int argc, const char *argv[]);
2514 static char *sip_show_peers(struct ast_cli_entry *e, int cmd, struct ast_cli_args *a);
2515 static char *sip_show_objects(struct ast_cli_entry *e, int cmd, struct ast_cli_args *a);
2516 static void print_group(int fd, ast_group_t group, int crlf);
2517 static const char *dtmfmode2str(int mode) attribute_const;
2518 static int str2dtmfmode(const char *str) attribute_unused;
2519 static const char *insecure2str(int mode) attribute_const;
2520 static void cleanup_stale_contexts(char *new, char *old);
2521 static void print_codec_to_cli(int fd, struct ast_codec_pref *pref);
2522 static const char *domain_mode_to_text(const enum domain_mode mode);
2523 static char *sip_show_domains(struct ast_cli_entry *e, int cmd, struct ast_cli_args *a);
2524 static char *_sip_show_peer(int type, int fd, struct mansession *s, const struct message *m, int argc, const char *argv[]);
2525 static char *sip_show_peer(struct ast_cli_entry *e, int cmd, struct ast_cli_args *a);
2526 static char *_sip_qualify_peer(int type, int fd, struct mansession *s, const struct message *m, int argc, const char *argv[]);
2527 static char *sip_qualify_peer(struct ast_cli_entry *e, int cmd, struct ast_cli_args *a);
2528 static char *sip_show_registry(struct ast_cli_entry *e, int cmd, struct ast_cli_args *a);
2529 static char *sip_unregister(struct ast_cli_entry *e, int cmd, struct ast_cli_args *a);
2530 static char *sip_show_settings(struct ast_cli_entry *e, int cmd, struct ast_cli_args *a);
2531 static char *sip_show_mwi(struct ast_cli_entry *e, int cmd, struct ast_cli_args *a);
2532 static const char *subscription_type2str(enum subscriptiontype subtype) attribute_pure;
2533 static const struct cfsubscription_types *find_subscription_type(enum subscriptiontype subtype);
2534 static char *complete_sip_peer(const char *word, int state, int flags2);
2535 static char *complete_sip_registered_peer(const char *word, int state, int flags2);
2536 static char *complete_sip_show_history(const char *line, const char *word, int pos, int state);
2537 static char *complete_sip_show_peer(const char *line, const char *word, int pos, int state);
2538 static char *complete_sip_unregister(const char *line, const char *word, int pos, int state);
2539 static char *complete_sipnotify(const char *line, const char *word, int pos, int state);
2540 static char *sip_show_channel(struct ast_cli_entry *e, int cmd, struct ast_cli_args *a);
2541 static char *sip_show_channelstats(struct ast_cli_entry *e, int cmd, struct ast_cli_args *a);
2542 static char *sip_show_history(struct ast_cli_entry *e, int cmd, struct ast_cli_args *a);
2543 static char *sip_do_debug_ip(int fd, const char *arg);
2544 static char *sip_do_debug_peer(int fd, const char *arg);
2545 static char *sip_do_debug(struct ast_cli_entry *e, int cmd, struct ast_cli_args *a);
2546 static char *sip_cli_notify(struct ast_cli_entry *e, int cmd, struct ast_cli_args *a);
2547 static char *sip_set_history(struct ast_cli_entry *e, int cmd, struct ast_cli_args *a);
2548 static int sip_dtmfmode(struct ast_channel *chan, const char *data);
2549 static int sip_addheader(struct ast_channel *chan, const char *data);
2550 static int sip_do_reload(enum channelreloadreason reason);
2551 static char *sip_reload(struct ast_cli_entry *e, int cmd, struct ast_cli_args *a);
2552 static int acf_channel_read(struct ast_channel *chan, const char *funcname, char *preparse, char *buf, size_t buflen);
2555 Functions for enabling debug per IP or fully, or enabling history logging for
2558 static void sip_dump_history(struct sip_pvt *dialog); /* Dump history to debuglog at end of dialog, before destroying data */
2559 static inline int sip_debug_test_addr(const struct sockaddr_in *addr);
2560 static inline int sip_debug_test_pvt(struct sip_pvt *p);
2563 /*! \brief Append to SIP dialog history
2564 \return Always returns 0 */
2565 #define append_history(p, event, fmt , args... ) append_history_full(p, "%-15s " fmt, event, ## args)
2566 static void append_history_full(struct sip_pvt *p, const char *fmt, ...);
2567 static void sip_dump_history(struct sip_pvt *dialog);
2569 /*--- Device object handling */
2570 static struct sip_peer *build_peer(const char *name, struct ast_variable *v, struct ast_variable *alt, int realtime);
2571 static int update_call_counter(struct sip_pvt *fup, int event);
2572 static void sip_destroy_peer(struct sip_peer *peer);
2573 static void sip_destroy_peer_fn(void *peer);
2574 static void set_peer_defaults(struct sip_peer *peer);
2575 static struct sip_peer *temp_peer(const char *name);
2576 static void register_peer_exten(struct sip_peer *peer, int onoff);
2577 static struct sip_peer *find_peer(const char *peer, struct sockaddr_in *sin, int realtime, int forcenamematch, int devstate_only);
2578 static int sip_poke_peer_s(const void *data);
2579 static enum parse_register_result parse_register_contact(struct sip_pvt *pvt, struct sip_peer *p, struct sip_request *req);
2580 static void reg_source_db(struct sip_peer *peer);
2581 static void destroy_association(struct sip_peer *peer);
2582 static void set_insecure_flags(struct ast_flags *flags, const char *value, int lineno);
2583 static int handle_common_options(struct ast_flags *flags, struct ast_flags *mask, struct ast_variable *v);
2584 static void set_socket_transport(struct sip_socket *socket, int transport);
2586 /* Realtime device support */
2587 static void realtime_update_peer(const char *peername, struct sockaddr_in *sin, const char *username, const char *fullcontact, const char *useragent, int expirey, int deprecated_username, int lastms);
2588 static void update_peer(struct sip_peer *p, int expire);
2589 static struct ast_variable *get_insecure_variable_from_config(struct ast_config *config);
2590 static const char *get_name_from_variable(struct ast_variable *var, const char *newpeername);
2591 static struct sip_peer *realtime_peer(const char *peername, struct sockaddr_in *sin, int devstate_only);
2592 static char *sip_prune_realtime(struct ast_cli_entry *e, int cmd, struct ast_cli_args *a);
2594 /*--- Internal UA client handling (outbound registrations) */
2595 static void ast_sip_ouraddrfor(struct in_addr *them, struct sockaddr_in *us, struct sip_pvt *p);
2596 static void sip_registry_destroy(struct sip_registry *reg);
2597 static int sip_register(const char *value, int lineno);
2598 static const char *regstate2str(enum sipregistrystate regstate) attribute_const;
2599 static int sip_reregister(const void *data);
2600 static int __sip_do_register(struct sip_registry *r);
2601 static int sip_reg_timeout(const void *data);
2602 static void sip_send_all_registers(void);
2603 static int sip_reinvite_retry(const void *data);
2605 /*--- Parsing SIP requests and responses */
2606 static void append_date(struct sip_request *req); /* Append date to SIP packet */
2607 static int determine_firstline_parts(struct sip_request *req);
2608 static const struct cfsubscription_types *find_subscription_type(enum subscriptiontype subtype);
2609 static const char *gettag(const struct sip_request *req, const char *header, char *tagbuf, int tagbufsize);
2610 static int find_sip_method(const char *msg);
2611 static unsigned int parse_sip_options(struct sip_pvt *pvt, const char *supported);
2612 static unsigned int parse_allowed_methods(struct sip_request *req);
2613 static unsigned int set_pvt_allowed_methods(struct sip_pvt *pvt, struct sip_request *req);
2614 static int parse_request(struct sip_request *req);
2615 static const char *get_header(const struct sip_request *req, const char *name);
2616 static const char *referstatus2str(enum referstatus rstatus) attribute_pure;
2617 static int method_match(enum sipmethod id, const char *name);
2618 static void parse_copy(struct sip_request *dst, const struct sip_request *src);
2619 static char *get_in_brackets(char *tmp);
2620 static const char *find_alias(const char *name, const char *_default);
2621 static const char *__get_header(const struct sip_request *req, const char *name, int *start);
2622 static int lws2sws(char *msgbuf, int len);
2623 static void extract_uri(struct sip_pvt *p, struct sip_request *req);
2624 static char *remove_uri_parameters(char *uri);
2625 static int get_refer_info(struct sip_pvt *transferer, struct sip_request *outgoing_req);
2626 static int get_also_info(struct sip_pvt *p, struct sip_request *oreq);
2627 static int parse_ok_contact(struct sip_pvt *pvt, struct sip_request *req);
2628 static int set_address_from_contact(struct sip_pvt *pvt);
2629 static void check_via(struct sip_pvt *p, struct sip_request *req);
2630 static char *get_calleridname(const char *input, char *output, size_t outputsize);
2631 static int get_rpid(struct sip_pvt *p, struct sip_request *oreq);
2632 static int get_rdnis(struct sip_pvt *p, struct sip_request *oreq, char **name, char **number, int *reason);
2633 static int get_destination(struct sip_pvt *p, struct sip_request *oreq);
2634 static int get_msg_text(char *buf, int len, struct sip_request *req, int addnewline);
2635 static int transmit_state_notify(struct sip_pvt *p, int state, int full, int timeout);
2636 static void update_connectedline(struct sip_pvt *p, const void *data, size_t datalen);
2637 static void update_redirecting(struct sip_pvt *p, const void *data, size_t datalen);
2638 static void change_redirecting_information(struct sip_pvt *p, struct sip_request *req, struct ast_party_redirecting *redirecting, int set_call_forward);
2640 /*-- TCP connection handling ---*/
2641 static void *_sip_tcp_helper_thread(struct sip_pvt *pvt, struct ast_tcptls_session_instance *tcptls_session);
2642 static void *sip_tcp_worker_fn(void *);
2644 /*--- Constructing requests and responses */
2645 static void initialize_initreq(struct sip_pvt *p, struct sip_request *req);
2646 static int init_req(struct sip_request *req, int sipmethod, const char *recip);
2647 static int reqprep(struct sip_request *req, struct sip_pvt *p, int sipmethod, int seqno, int newbranch);
2648 static void initreqprep(struct sip_request *req, struct sip_pvt *p, int sipmethod);
2649 static int init_resp(struct sip_request *resp, const char *msg);
2650 static inline int resp_needs_contact(const char *msg, enum sipmethod method);
2651 static int respprep(struct sip_request *resp, struct sip_pvt *p, const char *msg, const struct sip_request *req);
2652 static const struct sockaddr_in *sip_real_dst(const struct sip_pvt *p);
2653 static void build_via(struct sip_pvt *p);
2654 static int create_addr_from_peer(struct sip_pvt *r, struct sip_peer *peer);
2655 static int create_addr(struct sip_pvt *dialog, const char *opeer, struct sockaddr_in *sin, int newdialog);
2656 static char *generate_random_string(char *buf, size_t size);
2657 static void build_callid_pvt(struct sip_pvt *pvt);
2658 static void build_callid_registry(struct sip_registry *reg, struct in_addr ourip, const char *fromdomain);
2659 static void make_our_tag(char *tagbuf, size_t len);
2660 static int add_header(struct sip_request *req, const char *var, const char *value);
2661 static int add_header_contentLength(struct sip_request *req, int len);
2662 static int add_line(struct sip_request *req, const char *line);
2663 static int add_text(struct sip_request *req, const char *text);
2664 static int add_digit(struct sip_request *req, char digit, unsigned int duration, int mode);
2665 static int add_rpid(struct sip_request *req, struct sip_pvt *p);
2666 static int add_vidupdate(struct sip_request *req);
2667 static void add_route(struct sip_request *req, struct sip_route *route);
2668 static int copy_header(struct sip_request *req, const struct sip_request *orig, const char *field);
2669 static int copy_all_header(struct sip_request *req, const struct sip_request *orig, const char *field);
2670 static int copy_via_headers(struct sip_pvt *p, struct sip_request *req, const struct sip_request *orig, const char *field);
2671 static void set_destination(struct sip_pvt *p, char *uri);
2672 static void append_date(struct sip_request *req);
2673 static void build_contact(struct sip_pvt *p);
2675 /*------Request handling functions */
2676 static int handle_incoming(struct sip_pvt *p, struct sip_request *req, struct sockaddr_in *sin, int *recount, int *nounlock);
2677 static int handle_request_update(struct sip_pvt *p, struct sip_request *req);
2678 static int handle_request_invite(struct sip_pvt *p, struct sip_request *req, int debug, int seqno, struct sockaddr_in *sin, int *recount, const char *e, int *nounlock);
2679 static int handle_request_refer(struct sip_pvt *p, struct sip_request *req, int debug, int seqno, int *nounlock);
2680 static int handle_request_bye(struct sip_pvt *p, struct sip_request *req);
2681 static int handle_request_register(struct sip_pvt *p, struct sip_request *req, struct sockaddr_in *sin, const char *e);
2682 static int handle_request_cancel(struct sip_pvt *p, struct sip_request *req);
2683 static int handle_request_message(struct sip_pvt *p, struct sip_request *req);
2684 static int handle_request_subscribe(struct sip_pvt *p, struct sip_request *req, struct sockaddr_in *sin, int seqno, const char *e);
2685 static void handle_request_info(struct sip_pvt *p, struct sip_request *req);
2686 static int handle_request_options(struct sip_pvt *p, struct sip_request *req);
2687 static int handle_invite_replaces(struct sip_pvt *p, struct sip_request *req, int debug, int seqno, struct sockaddr_in *sin);
2688 static int handle_request_notify(struct sip_pvt *p, struct sip_request *req, struct sockaddr_in *sin, int seqno, const char *e);
2689 static int local_attended_transfer(struct sip_pvt *transferer, struct sip_dual *current, struct sip_request *req, int seqno);
2691 /*------Response handling functions */
2692 static void handle_response_invite(struct sip_pvt *p, int resp, const char *rest, struct sip_request *req, int seqno);
2693 static void handle_response_notify(struct sip_pvt *p, int resp, const char *rest, struct sip_request *req, int seqno);
2694 static void handle_response_refer(struct sip_pvt *p, int resp, const char *rest, struct sip_request *req, int seqno);
2695 static void handle_response_subscribe(struct sip_pvt *p, int resp, const char *rest, struct sip_request *req, int seqno);
2696 static int handle_response_register(struct sip_pvt *p, int resp, const char *rest, struct sip_request *req, int seqno);
2697 static void handle_response(struct sip_pvt *p, int resp, const char *rest, struct sip_request *req, int seqno);
2699 /*------ T38 Support --------- */
2700 static int transmit_response_with_t38_sdp(struct sip_pvt *p, char *msg, struct sip_request *req, int retrans);
2701 static struct ast_udptl *sip_get_udptl_peer(struct ast_channel *chan);
2702 static int sip_set_udptl_peer(struct ast_channel *chan, struct ast_udptl *udptl);
2703 static void change_t38_state(struct sip_pvt *p, int state);
2705 /*------ Session-Timers functions --------- */
2706 static void proc_422_rsp(struct sip_pvt *p, struct sip_request *rsp);
2707 static int proc_session_timer(const void *vp);
2708 static void stop_session_timer(struct sip_pvt *p);
2709 static void start_session_timer(struct sip_pvt *p);
2710 static void restart_session_timer(struct sip_pvt *p);
2711 static const char *strefresher2str(enum st_refresher r);
2712 static int parse_session_expires(const char *p_hdrval, int *const p_interval, enum st_refresher *const p_ref);
2713 static int parse_minse(const char *p_hdrval, int *const p_interval);
2714 static int st_get_se(struct sip_pvt *, int max);
2715 static enum st_refresher st_get_refresher(struct sip_pvt *);
2716 static enum st_mode st_get_mode(struct sip_pvt *);
2717 static struct sip_st_dlg* sip_st_alloc(struct sip_pvt *const p);
2719 /*------- RTP Glue functions -------- */
2720 static int sip_set_rtp_peer(struct ast_channel *chan, struct ast_rtp_instance *instance, struct ast_rtp_instance *vinstance, struct ast_rtp_instance *tinstance, int codecs, int nat_active);
2722 /*!--- SIP MWI Subscription support */
2723 static int sip_subscribe_mwi(const char *value, int lineno);
2724 static void sip_subscribe_mwi_destroy(struct sip_subscription_mwi *mwi);
2725 static void sip_send_all_mwi_subscriptions(void);
2726 static int sip_subscribe_mwi_do(const void *data);
2727 static int __sip_subscribe_mwi_do(struct sip_subscription_mwi *mwi);
2729 /*! \brief Definition of this channel for PBX channel registration */
2730 static const struct ast_channel_tech sip_tech = {
2732 .description = "Session Initiation Protocol (SIP)",
2733 .capabilities = AST_FORMAT_AUDIO_MASK, /* all audio formats */
2734 .properties = AST_CHAN_TP_WANTSJITTER | AST_CHAN_TP_CREATESJITTER,
2735 .requester = sip_request_call, /* called with chan unlocked */
2736 .devicestate = sip_devicestate, /* called with chan unlocked (not chan-specific) */
2737 .call = sip_call, /* called with chan locked */
2738 .send_html = sip_sendhtml,
2739 .hangup = sip_hangup, /* called with chan locked */
2740 .answer = sip_answer, /* called with chan locked */
2741 .read = sip_read, /* called with chan locked */
2742 .write = sip_write, /* called with chan locked */
2743 .write_video = sip_write, /* called with chan locked */
2744 .write_text = sip_write,
2745 .indicate = sip_indicate, /* called with chan locked */
2746 .transfer = sip_transfer, /* called with chan locked */
2747 .fixup = sip_fixup, /* called with chan locked */
2748 .send_digit_begin = sip_senddigit_begin, /* called with chan unlocked */
2749 .send_digit_end = sip_senddigit_end,
2750 .bridge = ast_rtp_instance_bridge, /* XXX chan unlocked ? */
2751 .early_bridge = ast_rtp_instance_early_bridge,
2752 .send_text = sip_sendtext, /* called with chan locked */
2753 .func_channel_read = acf_channel_read,
2754 .setoption = sip_setoption,
2755 .queryoption = sip_queryoption,
2756 .get_pvt_uniqueid = sip_get_callid,
2759 /*! \brief This version of the sip channel tech has no send_digit_begin
2760 * callback so that the core knows that the channel does not want
2761 * DTMF BEGIN frames.
2762 * The struct is initialized just before registering the channel driver,
2763 * and is for use with channels using SIP INFO DTMF.
2765 static struct ast_channel_tech sip_tech_info;
2768 /*! \brief Working TLS connection configuration */
2769 static struct ast_tls_config sip_tls_cfg;
2771 /*! \brief Default TLS connection configuration */
2772 static struct ast_tls_config default_tls_cfg;
2774 /*! \brief The TCP server definition */
2775 static struct ast_tcptls_session_args sip_tcp_desc = {
2777 .master = AST_PTHREADT_NULL,
2780 .name = "SIP TCP server",
2781 .accept_fn = ast_tcptls_server_root,
2782 .worker_fn = sip_tcp_worker_fn,
2785 /*! \brief The TCP/TLS server definition */
2786 static struct ast_tcptls_session_args sip_tls_desc = {
2788 .master = AST_PTHREADT_NULL,
2789 .tls_cfg = &sip_tls_cfg,
2791 .name = "SIP TLS server",
2792 .accept_fn = ast_tcptls_server_root,
2793 .worker_fn = sip_tcp_worker_fn,
2796 /* wrapper macro to tell whether t points to one of the sip_tech descriptors */
2797 #define IS_SIP_TECH(t) ((t) == &sip_tech || (t) == &sip_tech_info)
2799 /*! \brief map from an integer value to a string.
2800 * If no match is found, return errorstring
2802 static const char *map_x_s(const struct _map_x_s *table, int x, const char *errorstring)
2804 const struct _map_x_s *cur;
2806 for (cur = table; cur->s; cur++)
2812 /*! \brief map from a string to an integer value, case insensitive.
2813 * If no match is found, return errorvalue.
2815 static int map_s_x(const struct _map_x_s *table, const char *s, int errorvalue)
2817 const struct _map_x_s *cur;
2819 for (cur = table; cur->s; cur++)
2820 if (!strcasecmp(cur->s, s))
2826 * duplicate a list of channel variables, \return the copy.
2828 static struct ast_variable *copy_vars(struct ast_variable *src)
2830 struct ast_variable *res = NULL, *tmp, *v = NULL;
2832 for (v = src ; v ; v = v->next) {
2833 if ((tmp = ast_variable_new(v->name, v->value, v->file))) {
2841 /*! \brief SIP TCP connection handler */
2842 static void *sip_tcp_worker_fn(void *data)
2844 struct ast_tcptls_session_instance *tcptls_session = data;
2846 return _sip_tcp_helper_thread(NULL, tcptls_session);
2849 /*! \brief SIP TCP thread management function
2850 This function reads from the socket, parses the packet into a request
2852 static void *_sip_tcp_helper_thread(struct sip_pvt *pvt, struct ast_tcptls_session_instance *tcptls_session)
2855 struct sip_request req = { 0, } , reqcpy = { 0, };
2856 struct sip_threadinfo *me;
2857 char buf[1024] = "";
2859 me = ast_calloc(1, sizeof(*me));
2864 me->threadid = pthread_self();
2865 me->tcptls_session = tcptls_session;
2866 if (tcptls_session->ssl)
2867 me->type = SIP_TRANSPORT_TLS;
2869 me->type = SIP_TRANSPORT_TCP;
2871 ast_debug(2, "Starting thread for %s server\n", tcptls_session->ssl ? "SSL" : "TCP");
2873 AST_LIST_LOCK(&threadl);
2874 AST_LIST_INSERT_TAIL(&threadl, me, list);
2875 AST_LIST_UNLOCK(&threadl);
2877 if (!(req.data = ast_str_create(SIP_MIN_PACKET)))
2879 if (!(reqcpy.data = ast_str_create(SIP_MIN_PACKET)))
2883 struct ast_str *str_save;
2885 str_save = req.data;
2886 memset(&req, 0, sizeof(req));
2887 req.data = str_save;
2888 ast_str_reset(req.data);
2890 str_save = reqcpy.data;
2891 memset(&reqcpy, 0, sizeof(reqcpy));
2892 reqcpy.data = str_save;
2893 ast_str_reset(reqcpy.data);
2895 memset(buf, 0, sizeof(buf));
2897 if (tcptls_session->ssl) {
2898 set_socket_transport(&req.socket, SIP_TRANSPORT_TLS);
2899 req.socket.port = htons(ourport_tls);
2901 set_socket_transport(&req.socket, SIP_TRANSPORT_TCP);
2902 req.socket.port = htons(ourport_tcp);
2904 req.socket.fd = tcptls_session->fd;
2905 res = ast_wait_for_input(tcptls_session->fd, -1);
2907 ast_debug(2, "SIP %s server :: ast_wait_for_input returned %d\n", tcptls_session->ssl ? "SSL": "TCP", res);
2911 /* Read in headers one line at a time */
2912 while (req.len < 4 || strncmp(REQ_OFFSET_TO_STR(&req, len - 4), "\r\n\r\n", 4)) {
2913 ast_mutex_lock(&tcptls_session->lock);
2914 if (!fgets(buf, sizeof(buf), tcptls_session->f)) {
2915 ast_mutex_unlock(&tcptls_session->lock);
2918 ast_mutex_unlock(&tcptls_session->lock);
2921 ast_str_append(&req.data, 0, "%s", buf);
2922 req.len = req.data->used;
2924 copy_request(&reqcpy, &req);
2925 parse_request(&reqcpy);
2926 /* In order to know how much to read, we need the content-length header */
2927 if (sscanf(get_header(&reqcpy, "Content-Length"), "%d", &cl)) {
2929 ast_mutex_lock(&tcptls_session->lock);
2930 if (!fread(buf, (cl < sizeof(buf)) ? cl : sizeof(buf), 1, tcptls_session->f)) {
2931 ast_mutex_unlock(&tcptls_session->lock);
2934 ast_mutex_unlock(&tcptls_session->lock);
2938 ast_str_append(&req.data, 0, "%s", buf);
2939 req.len = req.data->used;
2942 /*! \todo XXX If there's no Content-Length or if the content-length and what
2943 we receive is not the same - we should generate an error */
2945 req.socket.tcptls_session = tcptls_session;
2946 handle_request_do(&req, &tcptls_session->remote_address);
2950 AST_LIST_LOCK(&threadl);
2951 AST_LIST_REMOVE(&threadl, me, list);
2952 AST_LIST_UNLOCK(&threadl);
2955 fclose(tcptls_session->f);
2956 tcptls_session->f = NULL;
2957 tcptls_session->fd = -1;
2959 ast_free(reqcpy.data);
2967 ast_debug(2, "Shutting down thread for %s server\n", tcptls_session->ssl ? "SSL" : "TCP");
2970 ao2_ref(tcptls_session, -1);
2971 tcptls_session = NULL;
2978 * helper functions to unreference various types of objects.
2979 * By handling them this way, we don't have to declare the
2980 * destructor on each call, which removes the chance of errors.
2982 static void *unref_peer(struct sip_peer *peer, char *tag)
2984 ao2_t_ref(peer, -1, tag);
2988 static struct sip_peer *ref_peer(struct sip_peer *peer, char *tag)
2990 ao2_t_ref(peer, 1, tag);
2994 /*! \brief maintain proper refcounts for a sip_pvt's outboundproxy
2996 * This function sets pvt's outboundproxy pointer to the one referenced
2997 * by the proxy parameter. Because proxy may be a refcounted object, and
2998 * because pvt's old outboundproxy may also be a refcounted object, we need
2999 * to maintain the proper refcounts.
3001 * \param pvt The sip_pvt for which we wish to set the outboundproxy
3002 * \param proxy The sip_proxy which we will point pvt towards.
3003 * \return Returns void
3005 static void ref_proxy(struct sip_pvt *pvt, struct sip_proxy *proxy)
3007 struct sip_proxy *old_obproxy = pvt->outboundproxy;
3008 /* The sip_cfg.outboundproxy is statically allocated, and so
3009 * we don't ever need to adjust refcounts for it
3011 if (proxy && proxy != &sip_cfg.outboundproxy) {
3014 pvt->outboundproxy = proxy;
3015 if (old_obproxy && old_obproxy != &sip_cfg.outboundproxy) {
3016 ao2_ref(old_obproxy, -1);
3021 * \brief Unlink a dialog from the dialogs container, as well as any other places
3022 * that it may be currently stored.
3024 * \note A reference to the dialog must be held before calling this function, and this
3025 * function does not release that reference.
3027 static void *dialog_unlink_all(struct sip_pvt *dialog, int lockowner, int lockdialoglist)
3031 dialog_ref(dialog, "Let's bump the count in the unlink so it doesn't accidentally become dead before we are done");
3033 ao2_t_unlink(dialogs, dialog, "unlinking dialog via ao2_unlink");
3035 /* Unlink us from the owner (channel) if we have one */
3036 if (dialog->owner) {
3038 ast_channel_lock(dialog->owner);
3039 ast_debug(1, "Detaching from channel %s\n", dialog->owner->name);
3040 dialog->owner->tech_pvt = dialog_unref(dialog->owner->tech_pvt, "resetting channel dialog ptr in unlink_all");
3042 ast_channel_unlock(dialog->owner);
3044 if (dialog->registry) {
3045 if (dialog->registry->call == dialog)
3046 dialog->registry->call = dialog_unref(dialog->registry->call, "nulling out the registry's call dialog field in unlink_all");
3047 dialog->registry = registry_unref(dialog->registry, "delete dialog->registry");
3049 if (dialog->stateid > -1) {
3050 ast_extension_state_del(dialog->stateid, NULL);
3051 dialog_unref(dialog, "removing extension_state, should unref the associated dialog ptr that was stored there.");
3052 dialog->stateid = -1; /* shouldn't we 'zero' this out? */
3054 /* Remove link from peer to subscription of MWI */
3055 if (dialog->relatedpeer && dialog->relatedpeer->mwipvt == dialog)
3056 dialog->relatedpeer->mwipvt = dialog_unref(dialog->relatedpeer->mwipvt, "delete ->relatedpeer->mwipvt");
3057 if (dialog->relatedpeer && dialog->relatedpeer->call == dialog)
3058 dialog->relatedpeer->call = dialog_unref(dialog->relatedpeer->call, "unset the relatedpeer->call field in tandem with relatedpeer field itself");
3060 /* remove all current packets in this dialog */
3061 while((cp = dialog->packets)) {
3062 dialog->packets = dialog->packets->next;
3063 AST_SCHED_DEL(sched, cp->retransid);
3064 dialog_unref(cp->owner, "remove all current packets in this dialog, and the pointer to the dialog too as part of __sip_destroy");
3071 AST_SCHED_DEL_UNREF(sched, dialog->waitid, dialog_unref(dialog, "when you delete the waitid sched, you should dec the refcount for the stored dialog ptr"));
3073 AST_SCHED_DEL_UNREF(sched, dialog->initid, dialog_unref(dialog, "when you delete the initid sched, you should dec the refcount for the stored dialog ptr"));
3075 if (dialog->autokillid > -1)
3076 AST_SCHED_DEL_UNREF(sched, dialog->autokillid, dialog_unref(dialog, "when you delete the autokillid sched, you should dec the refcount for the stored dialog ptr"));
3078 if (dialog->request_queue_sched_id > -1) {
3079 AST_SCHED_DEL_UNREF(sched, dialog->request_queue_sched_id, dialog_unref(dialog, "when you delete the request_queue_sched_id sched, you should dec the refcount for the stored dialog ptr"));
3082 if (dialog->t38id > -1) {
3083 AST_SCHED_DEL_UNREF(sched, dialog->t38id, dialog_unref(dialog, "when you delete the t38id sched, you should dec the refcount for the stored dialog ptr"));
3086 dialog_unref(dialog, "Let's unbump the count in the unlink so the poor pvt can disappear if it is time");
3090 static void *registry_unref(struct sip_registry *reg, char *tag)
3092 ast_debug(3, "SIP Registry %s: refcount now %d\n", reg->hostname, reg->refcount - 1);
3093 ASTOBJ_UNREF(reg, sip_registry_destroy);
3097 /*! \brief Add object reference to SIP registry */
3098 static struct sip_registry *registry_addref(struct sip_registry *reg, char *tag)
3100 ast_debug(3, "SIP Registry %s: refcount now %d\n", reg->hostname, reg->refcount + 1);
3101 return ASTOBJ_REF(reg); /* Add pointer to registry in packet */
3104 /*! \brief Interface structure with callbacks used to connect to UDPTL module*/
3105 static struct ast_udptl_protocol sip_udptl = {
3107 get_udptl_info: sip_get_udptl_peer,
3108 set_udptl_peer: sip_set_udptl_peer,
3111 static void append_history_full(struct sip_pvt *p, const char *fmt, ...)
3112 __attribute__((format(printf, 2, 3)));
3115 /*! \brief Convert transfer status to string */
3116 static const char *referstatus2str(enum referstatus rstatus)
3118 return map_x_s(referstatusstrings, rstatus, "");
3121 static inline void pvt_set_needdestroy(struct sip_pvt *pvt, const char *reason)
3123 append_history(pvt, "NeedDestroy", "Setting needdestroy because %s", reason);
3124 pvt->needdestroy = 1;
3127 /*! \brief Initialize the initital request packet in the pvt structure.
3128 This packet is used for creating replies and future requests in
3130 static void initialize_initreq(struct sip_pvt *p, struct sip_request *req)
3132 if (p->initreq.headers)
3133 ast_debug(1, "Initializing already initialized SIP dialog %s (presumably reinvite)\n", p->callid);
3135 ast_debug(1, "Initializing initreq for method %s - callid %s\n", sip_methods[req->method].text, p->callid);
3136 /* Use this as the basis */
3137 copy_request(&p->initreq, req);
3138 parse_request(&p->initreq);
3140 ast_verbose("Initreq: %d headers, %d lines\n", p->initreq.headers, p->initreq.lines);
3143 /*! \brief Encapsulate setting of SIP_ALREADYGONE to be able to trace it with debugging */
3144 static void sip_alreadygone(struct sip_pvt *dialog)
3146 ast_debug(3, "Setting SIP_ALREADYGONE on dialog %s\n", dialog->callid);
3147 dialog->alreadygone = 1;
3150 /*! Resolve DNS srv name or host name in a sip_proxy structure */
3151 static int proxy_update(struct sip_proxy *proxy)
3153 /* if it's actually an IP address and not a name,
3154 there's no need for a managed lookup */
3155 if (!inet_aton(proxy->name, &proxy->ip.sin_addr)) {
3156 /* Ok, not an IP address, then let's check if it's a domain or host */
3157 /* XXX Todo - if we have proxy port, don't do SRV */
3158 if (ast_get_ip_or_srv(&proxy->ip, proxy->name, sip_cfg.srvlookup ? "_sip._udp" : NULL) < 0) {
3159 ast_log(LOG_WARNING, "Unable to locate host '%s'\n", proxy->name);
3163 proxy->last_dnsupdate = time(NULL);
3167 /*! \brief Allocate and initialize sip proxy */
3168 static struct sip_proxy *proxy_allocate(char *name, char *port, int force)
3170 struct sip_proxy *proxy;
3172 if (ast_strlen_zero(name)) {
3176 proxy = ao2_alloc(sizeof(*proxy), NULL);
3179 proxy->force = force;
3180 ast_copy_string(proxy->name, name, sizeof(proxy->name));
3181 proxy->ip.sin_port = htons((!ast_strlen_zero(port) ? atoi(port) : STANDARD_SIP_PORT));
3182 proxy_update(proxy);
3186 /*! \brief Get default outbound proxy or global proxy */
3187 static struct sip_proxy *obproxy_get(struct sip_pvt *dialog, struct sip_peer *peer)
3189 if (peer && peer->outboundproxy) {
3191 ast_debug(1, "OBPROXY: Applying peer OBproxy to this call\n");
3192 append_history(dialog, "OBproxy", "Using peer obproxy %s", peer->outboundproxy->name);
3193 return peer->outboundproxy;
3195 if (sip_cfg.outboundproxy.name[0]) {
3197 ast_debug(1, "OBPROXY: Applying global OBproxy to this call\n");
3198 append_history(dialog, "OBproxy", "Using global obproxy %s", sip_cfg.outboundproxy.name);
3199 return &sip_cfg.outboundproxy;
3202 ast_debug(1, "OBPROXY: Not applying OBproxy to this call\n");
3206 /*! \brief returns true if 'name' (with optional trailing whitespace)
3207 * matches the sip method 'id'.
3208 * Strictly speaking, SIP methods are case SENSITIVE, but we do
3209 * a case-insensitive comparison to be more tolerant.
3210 * following Jon Postel's rule: Be gentle in what you accept, strict with what you send
3212 static int method_match(enum sipmethod id, const char *name)
3214 int len = strlen(sip_methods[id].text);
3215 int l_name = name ? strlen(name) : 0;
3216 /* true if the string is long enough, and ends with whitespace, and matches */
3217 return (l_name >= len && name[len] < 33 &&
3218 !strncasecmp(sip_methods[id].text, name, len));
3221 /*! \brief find_sip_method: Find SIP method from header */
3222 static int find_sip_method(const char *msg)
3226 if (ast_strlen_zero(msg))
3228 for (i = 1; i < ARRAY_LEN(sip_methods) && !res; i++) {
3229 if (method_match(i, msg))
3230 res = sip_methods[i].id;
3235 /*! \brief Parse supported header in incoming packet */
3236 static unsigned int parse_sip_options(struct sip_pvt *pvt, const char *supported)
3240 unsigned int profile = 0;
3243 if (ast_strlen_zero(supported) )
3245 temp = ast_strdupa(supported);
3248 ast_debug(3, "Begin: parsing SIP \"Supported: %s\"\n", supported);
3250 for (next = temp; next; next = sep) {
3252 if ( (sep = strchr(next, ',')) != NULL)
3254 next = ast_skip_blanks(next);
3256 ast_debug(3, "Found SIP option: -%s-\n", next);
3257 for (i = 0; i < ARRAY_LEN(sip_options); i++) {
3258 if (!strcasecmp(next, sip_options[i].text)) {
3259 profile |= sip_options[i].id;
3262 ast_debug(3, "Matched SIP option: %s\n", next);
3267 /* This function is used to parse both Suported: and Require: headers.
3268 Let the caller of this function know that an unknown option tag was
3269 encountered, so that if the UAC requires it then the request can be
3270 rejected with a 420 response. */
3272 profile |= SIP_OPT_UNKNOWN;
3274 if (!found && sipdebug) {
3275 if (!strncasecmp(next, "x-", 2))
3276 ast_debug(3, "Found private SIP option, not supported: %s\n", next);
3278 ast_debug(3, "Found no match for SIP option: %s (Please file bug report!)\n", next);
3283 pvt->sipoptions = profile;
3287 /*! \brief See if we pass debug IP filter */
3288 static inline int sip_debug_test_addr(const struct sockaddr_in *addr)
3292 if (debugaddr.sin_addr.s_addr) {
3293 if (((ntohs(debugaddr.sin_port) != 0)
3294 && (debugaddr.sin_port != addr->sin_port))
3295 || (debugaddr.sin_addr.s_addr != addr->sin_addr.s_addr))
3301 /*! \brief The real destination address for a write */
3302 static const struct sockaddr_in *sip_real_dst(const struct sip_pvt *p)
3304 if (p->outboundproxy)
3305 return &p->outboundproxy->ip;
3307 return ast_test_flag(&p->flags[0], SIP_NAT_FORCE_RPORT) || ast_test_flag(&p->flags[0], SIP_NAT_RPORT_PRESENT) ? &p->recv : &p->sa;
3310 /*! \brief Display SIP nat mode */
3311 static const char *sip_nat_mode(const struct sip_pvt *p)
3313 return ast_test_flag(&p->flags[0], SIP_NAT_FORCE_RPORT) ? "NAT" : "no NAT";
3316 /*! \brief Test PVT for debugging output */
3317 static inline int sip_debug_test_pvt(struct sip_pvt *p)
3321 return sip_debug_test_addr(sip_real_dst(p));
3324 /*! \brief Return int representing a bit field of transport types found in const char *transport */
3325 static int get_transport_str2enum(const char *transport)
3329 if (ast_strlen_zero(transport)) {
3333 if (!strcasecmp(transport, "udp")) {
3334 res |= SIP_TRANSPORT_UDP;
3336 if (!strcasecmp(transport, "tcp")) {
3337 res |= SIP_TRANSPORT_TCP;
3339 if (!strcasecmp(transport, "tls")) {
3340 res |= SIP_TRANSPORT_TLS;
3346 /*! \brief Return configuration of transports for a device */
3347 static inline const char *get_transport_list(unsigned int transports) {
3348 switch (transports) {
3349 case SIP_TRANSPORT_UDP:
3351 case SIP_TRANSPORT_TCP:
3353 case SIP_TRANSPORT_TLS:
3355 case SIP_TRANSPORT_UDP | SIP_TRANSPORT_TCP:
3357 case SIP_TRANSPORT_UDP | SIP_TRANSPORT_TLS:
3359 case SIP_TRANSPORT_TCP | SIP_TRANSPORT_TLS:
3363 "TLS,TCP,UDP" : "UNKNOWN";
3367 /*! \brief Return transport as string */
3368 static inline const char *get_transport(enum sip_transport t)
3371 case SIP_TRANSPORT_UDP:
3373 case SIP_TRANSPORT_TCP:
3375 case SIP_TRANSPORT_TLS:
3382 /*! \brief Return transport of dialog.
3383 \note this is based on a false assumption. We don't always use the
3384 outbound proxy for all requests in a dialog. It depends on the
3385 "force" parameter. The FIRST request is always sent to the ob proxy.
3386 \todo Fix this function to work correctly
3388 static inline const char *get_transport_pvt(struct sip_pvt *p)
3390 if (p->outboundproxy && p->outboundproxy->transport) {